Rear-mounted aerodynamic structure for truck cargo bodies

ABSTRACT

Embodiments of the disclosure provide a foldable/retractable and unfoldable/deployable, rearwardly tapered aerodynamic assembly for use on the rear trailer bodies and other vehicles that accommodate dual swing-out doors. The aerodynamic assembly includes a right half mounted on the right hand door and a left half mounted on a left hand door. Each half can be constructed with a side panel, top panel and bottom panel, which each form half of an overall tapered box when deployed on the rear of the vehicle, the bottom panels and top panels being sealed together at a pair of overlapping weather seals along the centerline.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No. 14/861,862, filed Sep. 22, 2015, entitled REAR-MOUNTED AERODYNAMIC STRUCTURE FOR TRUCK CARGO BODIES, the entire disclosure of which is herein incorporated by reference, which is a continuation of U.S. patent application Ser. No. 14/231,593, filed Mar. 31, 2014, now U.S. Pat. No. 9,168,959, entitled REAR-MOUNTED AERODYNAMIC STRUCTURE FOR TRUCK CARGO BODIES, the entire disclosure of which is herein incorporated by reference, which is a continuation of U.S. patent application Ser. No. 13/752,374, filed Jan. 28, 2013, now U.S. Pat. No. 8,708,399, entitled REAR-MOUNTED AERODYNAMIC STRUCTURE FOR TRUCK CARGO BODIES, the entire disclosure of which is herein incorporated by reference, which is a continuation of U.S. patent application Ser. No. 12/903,770, filed Oct. 13, 2010, now U.S. Pat. No. 8,360,509, entitled REAR-MOUNTED AERODYNAMIC STRUCTURE FOR TRUCK CARGO BODIES, the entire disclosure of which is herein incorporated by reference; which is a continuation-in-part of U.S. patent application Ser. No. 12/122,645, filed May 16, 2008, now U.S. Pat. No. 8,100,461, entitled REAR-MOUNTED AERODYNAMIC STRUCTURE FOR TRUCK CARGO BODIES, the entire disclosure of which is also herein incorporated by reference; which claims the benefit of U.S. Provisional Application Ser. No. 61/039,411, filed Mar. 25, 2008, entitled REAR-MOUNTED AERODYNAMIC STRUCTURE FOR TRUCK CARGO BODIES, the entire disclosure of which is also herein incorporated by reference; and which also claims the benefit of U.S. Provisional Application Ser. No. 60/938,697, filed May 17, 2007, entitled REAR-MOUNTED AERODYNAMIC STRUCTURE FOR TRUCK CARGO BODIES, the entire disclosure of which is also herein incorporated by reference.

TECHNICAL FIELD

This invention relates to aerodynamic structures mounted on the rear end of truck bodies, and more particularly to deployable and retractable aerodynamic structures for use on truck bodies having rear doors.

BACKGROUND

Trucking is the primary mode of long-distance and short-haul transport for goods and materials in the United States, and many other countries. Trucks typically include a motorized cab in which the driver sits and operates the vehicle. The cab is attached to a box-like cargo section. Smaller trucks typically include an integral cargo section that sits on a unified frame which extends from the front wheels to the rear wheel assembly. Larger trucks often include a detachable cab unit, with multiple driven axles, and a separate trailer with a long box-like cargo unit seated atop two or more sets of wheel assemblies. These truck assemblages are commonly referred to as “semi-trailers” or “tractor trailers.” Most modern trucks' cabs, particularly those of tractor trailers, have been fitted with aerodynamic fairings on their roof, sides and front. These fairings assist in directing air over the exposed top of the box-like cargo body, which typically extends higher (by several feet) than the average cab roof. The flat, projecting front face of a cargo body is a substantial source of drag, above the cab roof. The use of such front-mounted aerodynamic fairings in recent years has served to significantly lower drag and, therefore, raise fuel economy for trucks, especially those traveling at high speed on open highways.

However, the rear end of the truck's cargo body has remained the same throughout its history. This is mainly because most trucks include large swinging or rolling doors on their rear face. Trucks may also include a lift gate or a lip that is suited particularly to backing the truck into a loading dock area so that goods can be unloaded from the cargo body. It is well-known that the provision of appropriate aerodynamic fairings (typically consisting of an inwardly tapered set of walls) would further reduce the aerodynamic profile of the truck by reducing drag at the rear face. The reduction of drag, in turn, increases fuel economy. By way merely of background, one such aerodynamic structure is shown and described in U.S. Pat. No. 6,595,578 entitled TRUCK AFTER-BODY DRAG REDUCTION DEVICE, by Kyril Calsoyas, et al., the teachings of which are expressly incorporated herein by reference.

Nevertheless, most attempts to provide aerodynamic structures that integrate with the structure and function of the rear cargo doors of a truck have been unsuccessful and/or impractical to use and operate. Such rear aerodynamic structures are typically large and difficult to remove from the rear so as to access the cargo doors when needed. One approach is to provide a structure that swings upwardly, completely out of the path of the doors. However, aerodynamic structures that swing upwardly require substantial strength or force to be moved away from the doors, and also require substantial height clearance above an already tall cargo body. Other solutions have attempted to provide an aerodynamic structure that hinges to one side of the cargo body. While this requires less force to move, it also requires substantial side clearance—which is generally absent from a closely packed, multi-truck loading dock.

In fact, most loading dock arrangements require that the relatively thin cargo doors of conventional trucks swing open fully to about 270 degrees so that they can be latched against the adjacent sides of the cargo body. Only in this manner can the truck be backed into a standard-side-clearance loading dock, which is often populated by a line of closely-spaced trailers that are frequently entering and leaving the dock. In such an environment, side-projecting or top-projecting fairings would invariably interfere with operations at the loading dock.

A possible solution is to bifurcate the aerodynamic structure into a left hinged and a right-hinged unit that defines a complete unit when closed, and hinges open to reveal the doors. However, the two separate sections still present a large projection that would be incapable of swinging the requisite 270 degrees, and would undesirably tend to project into the adjacent loading bays when opened.

Another alternative is to remove the fairing structure from the truck before it is parked at the loading bay. However, the removed structure must then be placed somewhere during the loading/unloading process. Because most truck doors are relatively large, being in the range of approximately 7-8 feet by 8-9 feet overall, removing, manipulating and storing a fairing in this manner may be impractical, or impossible, for the driver and loading dock staff.

Many other approached to providing an aerodynamic structure to the rear of a truck trailer body have been proposed. However most lack practicality and/or workability, and would either fail to perform as expected or pose too great an inconvenience to the operator. Nevertheless the need for such an aerodynamic structure is clear.

In the face of ever-increasing fuel costs, it is critical to develop aerodynamic structures that can be applied to the rear of a truck cargo body, either as an original fitment, or by retrofit to existing vehicles. These structures should exhibit durability and long service life, be easy to use by the average operator, not interfere with normal loading and unloading operations through a rear cargo door, and not add substantial additional cost or weight to the vehicle. The structure should exhibit a low profile on the vehicle frame and/or doors, not impede side clearance when the doors are opened, and where possible, allow for clearance with respect to conventional door latching mechanisms. Such structures should also allow for lighting on the rear, as well as other legally required structures. Moreover, given the large existing fleet of trucks and trailers, it is highly desirable that an aerodynamic structure be easily and inexpensively retrofittable to a wide range of existing vehicles without undue customization.

SUMMARY

This invention overcomes the disadvantages of the prior art by providing an aerodynamic structure attached to the rear face of a truck cargo body, which rear typically contains a door assembly, with a plurality of doors that swing open on hinges, or a single, full-width door, which rolls upwardly. The various embodiments of the invention allow an aerodynamic structure to be permanently attached to the rear of the trailer in a manner that would obscure access to the door(s) in a deployed position, in which the aerodynamic structure generates reduced drag on the trailer body, yet enables ready access to the door(s) in a folded position. The folded position still allows the rear of the trailer to be fully accessible for loading and unloading, and in the case of swinging, hinged doors (among others), allows the doors to be folded through a full 270-degree arc from a closed position to a position flush along the sides of the vehicle, with a minimal sideways projection. The various embodiments also enable relatively rapid and easy transition between the folded position and the deployed position using a variety of actuators and linkages that tie the folding and deployment of various panels of the structure together. This allows an operator to selectively fold and deploy the structure without undue effort or strength.

In an embodiment of the invention, the structure consists of a pair of opposing side or lateral panels that are oriented vertically and an assembly of upper and lower panels (or at least an upper panel) that adjoin the lateral panels. The structure is divided into a respective portion on each adjoining door—or is otherwise divided between the overall width of the trailer rear. This can be implemented by dividing the upper/lower panels along a medial dividing line so each half folds upon the underlying door. The four (or three) panels of each of the two, side-by-side hinged aerodynamic structure portions are separate, rigid, semi-rigid or semi-flexible panel units, which are each manually or automatically unfolded into the desired, tapered aerodynamic structure, and then locked in place with respect to each other.

In another embodiment of this invention, all the panels of the aerodynamic structure portion on a given door are interconnected by hinges so that the overall tapered box defines an “origami” type of folding arrangement. In such an arrangement, a vertical, medial panel is divided into three separate panel sections with the its upper and lower panel sections joined to adjacent horizontal top and bottom surfaces. The horizontal upper and lower surfaces are, likewise, each divided diagonally into a pair of upper and lower panel sections, respectively. The opposing upper and lower panels are hingedly attached to a one-piece outer vertical panel. When either the medial panel or the outer panel is moved toward or away from the underlying truck rear face/door, the force is transmitted throughout the structure, causing it to either fold or unfold, respectively. The separate panels are joined by sliding hinges or another type of hinge assembly (such as a flexible material) that facilitates the folding of each panel over the other by allowing the joined panel to translate, as well as rotate in two degrees of freedom. This facilitates the requisite origami folding pattern by allowing movement in two degrees of freedom. This accommodates the fact that the panels have a finite thickness.

The aerodynamic panels can be deployed from a folded orientation and refolded against the doors in a variety of manners. In general it is desirable to provide an easy and accessible technique to deploy the panels without need to access the upper panels—which may be hard for an operator to reach. A variety of illustrative systems and methods can be employed to coordinate deployment and folding of the panels—typically the upper and lower panels. The lower panels can be coupled to the upper panels using a linkage such as a swing arm framework that employs tie rods on each opposing panel (upper and lower), and also join to a central swinging arm structure with a vertical hinge axis. The movement of the lower panel is translated into a swinging motion about the vertical hinge axis that translates the motion to the upper panel. Other linkage mechanisms for a pair of opposing (typically upper and lower) panels include a folding medial panel attached to each door's upper and lower panels, a pneumatic/hydraulic master cylinder and slave cylinder, a flexible cable and/or an eccentric linking bar. In general, these linking mechanisms ensure that, when the lower panel is folded/deployed, the upper panel follows.

In one embodiment the upper and lower panels can be locked together using corner-mounted latches on one of the adjoining panels (typically the lateral panel) that engage lock pins on the other of the panels (typically each of the upper and lower panel). The latches can be spring-loaded and release together using a connecting linkage, such as a cord. In another embodiment the upper and lower panels can be locked and unlocked using a series of rotating blocks interconnected with vertical, rear-edge-mounted rods. In an “origami” embodiment, the medial panel of each folding structure portion interconnects with a stiffener bar that extends into an overlapping relation with the top and bottom medial panel sections, but is unattached to the top and bottom medial panel sections. A cord runs through a hollow aperture in the stiffener bar between an attachment point on one adjacent medial panel section and a loop on the opposing medial panel section. When the cord is tensioned, the stiffener bar is biased by the taut cord into engagement with the upper and lower medial panel sections, thereby forming a single, planar media panel. This motion forces the unfolding of the adjacent, interconnected horizontal and outer panel sections, thereby deploying the aerodynamic structure.

Linear actuators, or other mechanisms, can be used to automatically deploy and retract the origami-type structure (or other folding aerodynamic structures defined herein). The actuators can be located along the door or another portion of the rear of the trailer and can bear upon the medial panel, the outer vertical panel, or both. A controller can be provided, so that panels are automatically deployed at, or above, a given speed (for example, over 35 mph), and retracted below a given speed. Alternatively, the driver can control deployment and retraction from the cab.

In illustrative embodiments of the present invention, the aerodynamic structure can be mounted on a door with extended hinges that either overlie conventional, original butt hinges of a retrofitted trailer door frame, or are placed remote from the original hinges. In an illustrative implementation, the hinges can be formed with a streamlined outer cover, or constructed as part of an overall, elongated butt plate with cutouts and clevis plates attached at desired locations based upon the locations of preexisting hinge clevises. The butt plate is applied to the corner of the trailer frame thereby forming a relatively continuous and streamlined rear hinge extension. The pivot axis points of the extended hinges allow for a larger swing that enable the thickened door with the folded stack-up of aerodynamic panels to open approximately 270 degrees to a position flush with the side of the trailer. This facilitates movement of the trailer into a narrow loading dock space without interference by the aerodynamic structure. The extended hinges of various embodiments can have pivot points located anywhere within an arc relative to the original hinge axis points so as to extend the swing of the door and allow the doors with folded panels to be located adjacent to the side of the trailer.

In another embodiment, instead of the above-described single axis extended hinge, the extended hinge assembly can define a multi-axis hinge having at least one central hinge clevis. This multi-axis hinge assembly provides at least two separate, parallel hinge pivots that allow the thickened door unit (with attached spacer frame and nested, folded panels) to be opened a full 270 degrees so as to lie against the adjacent side of the cargo box. In one example, at least two of the hinge assemblies on each door can be geared so as to prevent racking of the door as it swings by maintaining it within a predetermined swing pattern as defined by meshing gears in each assembly. In other examples, the doors can be conventionally hinged, using extended hinge pivots, or another type of multi-axis hinge, such as a four-bar linkage, can be employed.

In various embodiments in which the trailer employs hinged doors, lock rods are used to secure the doors near the medial joint line therebetween. To allow for clearance over these lock rods when the panel structure is folded, the panels (upper and lower, for example) can be located on hinges that define an axis with a rearwardly directed angle when folded against the door so as to provide the needed clearance. This angled fold-line allows for decreased overall stack-up at the lateral side of the door, which results in less room needed between trailers at a dock when the doors are open. The panels can be mounted to the door on hinges with pivot points remote from the inner surface of the respective panel so that the forward (trailer-frame-confronting) edge is located adjacent to the side of the trailer body/door frame for added streamlining.

In another embodiment, to bridge the trailer door lock rods, a spacer frame can be attached onto or over a hinged trailer door and provide a hinged base member for a plurality of panels that, when folded or “collapsed,” are substantially or fully nested within the spacer frame and, when deployed, define the desired rearwardly tapered box-like aerodynamic structure. Typically, there are two separate spacer frames, each mounted on a respective swinging door of the overall door assembly. In one embodiment, each spacer frame contains its own folding aerodynamic assembly/structure, and each structure can include a central or medial panel (also termed a “splitter,” or another type of non-panel supporting member that defines a central support. Each splitter or medial panel relatively closely confronts the other medial panel. When the two aerodynamic structures are deployed they collectively define an aerodynamic structure having at least one tapered horizontal top surface and a pair of opposing tapered vertical side surfaces. The spacer frame is sized and arranged so that the various panels can be folded into an overlapping arrangement without binding on each other. In other words, some sides of the spacer frame are lower than others by an amount equal to, or greater than, the thickness of the attached panel.

The upper and lower panels of the structure can account for variability in the width of the doors, and any resulting gap by providing a medial wiper that seals between the medial facing edges of the panels to reduce/eliminate air leakage into the cavity defined by the panels. Other seals between panels, and between the panels and the door frame can also be provided. The presence of seals and other structures between the door and the frame can be accommodated by a spacer that positions the panel hinges rearwardly to overlie, for example, a preexisting door-to-frame gasket. The size of the spacer can be to allow accommodation of different-sized gaskets and differing positions for the forward end of the panel (to align its confrontation with the door frame edge).

In another embodiment, a door having relatively conventional hinges can be employed, with the door being modified to include inwardly (toward the cargo compartment) directed recesses into which individually house deployable, folded aerodynamic structures. The folded structures reside at, or below, the outer face of the surrounding door so that, when the doors are opened open to a 270-degree orientation from the closed position, they naturally lay flat against the trailer's sides with the structure-containing recesses projecting outwardly from the sides to a small degree.

In other embodiments, such as those applicable to a rolling rear cargo door (and also conventional, hinged, side-swinging doors), the aerodynamic structures can be provided on hinged secondary doors or frameworks that are separate from the underlying door, and are instead mounted on the outside trailer body frame that surrounds the door. To access the underlying cargo door, the two hinged structure frames are opened to 270 degrees, and secured to the sides of the trailer—and then the rolling door (or other form of door) is made accessible. Modified hinge assemblies using a central clevis and two spaced-apart parallel pivots can be employed to afford additional clearance needed to allow the frames to swing through 270 degrees. Likewise, the hinges for the secondary door or framework can be mounted on the above-described hinge butt plate, which is secured to the corner of the frame.

To facilitate required lighting in a flush-mounted, streamlined panel, lights can be surface mounted directly to the panel (particularly the upper panels). Alternatively, the aerodynamic structure can include a tapered frame-mounted header that includes built-in, flush-mounted lights. Likewise, the door frame-confronting edges of the panels (typically upper) can include a translucent or transparent section that expose lights mounted on the rear face of the frame while maintaining a streamlined structure. In another embodiment, the upper panels are mounted so that their adjacent edges mate with the top frame member at a location beneath any lighting on the top frame member of the trailer body so that the lighting remains visible.

In further embodiments of the invention a method for retrofitting an aerodynamic structure of a type described above is provided. This method includes identifying locations of existing door hinge clevises and removing the existing doors from the existing clevises. Extended hinge clevises are applied to the door frame, either individually, or as part of the elongated hinge butt plate that overlies and is secured to the vertical corner of each side of the door frame. In manufacturing the butt plate, slots or cutouts are formed in locations that match those of the existing clevises and opposing clevis plates with (typically rearward) extended pivot holes are attached to opposing sides of each cutout so as to eventually overlie the existing clevises. The doors are provided with door hinge portions that are located to align with the extended clevises. The door hinge portions can also include intermediate lateral panel hinges mounted on remote pivot axes formed on the hinge portions. The trailer doors are reattached to the new clevises using hinge pivots, such as bolts that pass through a tube in the hinge portions and the new clevis plate holes. The lateral panels on each door are attached to the intermediate lateral panel hinges and the upper and lower panels are attached to the door with folding hinges that can include an angled hinge line so as to enable angled folding that clears the door lock rod. The upper and lower panels can each include a medial sealing strip that is cutout at the appropriate location to allow clearance for the lock rod without excessive air leakage there around. The medial wiper is attached to each medial sealing strip to ensure a wind-tight connection. In one embodiment, a swing arm linkage is attached at an appropriate location on each door. The tie rods between the upper and lower panels are secured between the swing arm and the respective panels and a central rod that is threaded to opposing ball joints is rotated to appropriately adjust the length of each tie rod and thus the corresponding level of each panel with respect to the other.

This invention further overcomes disadvantages of the prior art by providing foldable/retractable and unfoldable/deployable, rearwardly tapered aerodynamic assembly for use on the rear trailer bodies and other vehicles that accommodate dual swing-out doors. The aerodynamic assembly includes a right half mounted on the right hand door and a left half mounted on a left hand door. Each half is constructed with a side panel, top panel and bottom panel, which form half of an overall tapered box when deployed on the rear of the vehicle, the bottom panels and top panels being sealed together at a pair of overlapping weather seals along the centerline. The panels are relatively thin, but durable, and are joined to each other by resilient strip hinges. The top and bottom panels are also hinged to form two sections along diagonal lines to facilitate folding of all panels in a relatively low-profile stacked orientation. This low profile allows the doors to be swung through approximately 270 degrees to be secured to the sides of the body in a manner that does not interfere with adjacent doors or bodies in, for example a multi-bay loading dock. A swing arm assembly and gas spring biases the panels into a deployed position that can be refolded by grasping the side panel and rotating it inward toward the door surface. The top and bottom panels are partly inwardly folded when deployed to define external valleys using a stop assembly. This ensures that the panels fold readily when desired without the two sections of the panels “locking up” due to an overly planar profile.

While the panels herein include weather seals to enhance aerodynamic efficiency, it is contemplated, in alternate embodiments that panels can confront each other with small gaps, free of an engaging seals. Alternatively the seals can be lightly engaging or provide small gaps therebetween that may become more closely engaging at high speeds (under increased airflow).

In an illustrative embodiment, the aerodynamic assembly provides a structure that moves between a folded orientation and an unfolded orientation for the rear of a vehicle body having a right hand door and a left hand door. A right aerodynamic assembly half is provided, with a right top panel including a top door-hinged section hingedly attached adjacent a top of the right hand door to fold downwardly, a right bottom panel including a bottom door-hinged section hingedly attached adjacent a bottom of the right hand door to fold upwardly and a right side panel hingedly attached adjacent an outboard edge of the right hand door to fold inwardly toward a center line between the right hand door and the left hand door, the top panel further including a top side panel-hinged section hingedly attached to each of the top door hinged section and a top region of the side panel and the bottom panel further including a bottom side panel-hinged section hingedly attached to each of the bottom door hinged section and a bottom region of the side panel. A left aerodynamic assembly half is also provided, with a left top panel including a top door-hinged section hingedly attached adjacent a top of the left hand door to fold downwardly, a left bottom panel including a bottom door-hinged section hingedly attached adjacent a bottom of the left hand door to fold upwardly and a side panel hingedly attached adjacent an outboard edge of the left hand door to fold inwardly toward a center line between the right and door and the left hand door, the top panel further including a top side panel-hinged section hingedly attached to each of the top door hinged section and a top region of the side panel and the bottom panel further including a bottom side panel-hinged section hingedly attached to each of the bottom door hinged section and a bottom region of the side panel. A right swing arm assembly is hingedly attached to the right hand door, and through a respective tie rod, to each of the right top panel and the right bottom panel. A left swing arm assembly is also hingedly attached to the left hand door, and through a respective tie rod, to each of the left top panel and the left bottom panel

In an illustrative embodiment, a spring assembly is operatively connected at a first end to at least one of the right hand door and the left hand door, and is constructed and arranged to respectively bias at least one of the right aerodynamic assembly half and the left aerodynamic assembly half into the unfolded orientation. This spring can include a damper and can illustratively comprise a gas spring that is mounted between a bracket on each door and a vertical member at the far end of each swing arm. In this manner the swing arm provides a coordinated bias force to the top and bottom panels, which, in turn bias the interconnected side panel into the unfolded orientation. Moreover, the top and bottom panels can be mounted on hinges to their respective door using hinges that define an angled hinge axis. In this manner the door-facing edges of top and bottom panels remain horizontal across the width when deployed, but define a gap that tapers inwardly when folded so as to provide clearance for the door lock rods and other components, such as the swing arm assemblies. In an embodiment, the panels are hinged together using strips of a resilient material that is fastened at each side of the junction to the associated panel. These hinges allow for breakage in the event of an impact, and also allow for modest misalignment when folded, thereby facilitating the stacking of the panels when folded. The side panels can include a latch component, such as a pin along their rear interior face. This selectively engages a second latch component on the exterior face of the bottom panel, near the door and centerline. In general, the bottom panels can be located at a position on the door above door lock rod handles for ease of access to the locking system when the panels are folded. Moreover, the bottom panels can be formed as an open framework, with hinge positions and other connection bases provided within the framework, similarly to those in a solid panel. An open framework reduces the chances of accretion of debris and snow in certain climates. The panels can also be mounted on dual-swinging doors or frameworks that selectively latch to the vehicle rear, and that swing outwardly to reveal an inner door of a non-dual-swinging, such as a roll up doors. The overlying doors or frameworks operate to swing approximately 270 degrees in the same manner as regular dual-swinging doors.

In another embodiment the aerodynamic assembly for the rear end of a vehicle body provides a four-sided arrangement of panels that taper in a rearward direction from a rear of the vehicle body, and being hingedly attached to at least one of a door assembly and a framework assembly that is hingedly attached to the vehicle body, the four-sided arrangement of panels including (a) a right hand top panel, a right hand side panel and a right hand bottom panel, hingedly joined so as to selectively unfold into a right hand folded orientation and unfold into a right hand deployed orientation and (b) a left hand top panel, a left hand side panel, left hand bottom panel hingedly joined so as to selectively unfold into a left hand folded orientation and unfold into a left hand deployed orientation. A right hand interconnection, that can comprise a swing arm assembly and a spring assembly, is provided between the right hand top panel and the right hand bottom panel constructed and arranged to cause the right hand top panel, the right hand side panel and the right hand bottom panel to self-collapse when the at least one door assembly and framework assembly is opened and rotated into engagement with a side of the vehicle body. Likewise, a left hand interconnection, that can also comprise a swing arm assembly and a spring assembly, is provided between the left hand top panel and the left hand bottom panel constructed and arranged to cause the left hand top panel, the left hand side panel and the left hand bottom panel to self-collapse when the at least one door assembly and framework assembly is opened and rotated into engagement with a side of the vehicle body.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention description below refers to the accompanying drawings, of which:

FIG. 1 is a perspective view of a truck trailer having an aerodynamic structure on its rear according to an illustrative embodiment of this invention;

FIG. 2 is a partial side view of the truck trailer rear of FIG. 1;

FIG. 3 is a rear view of the truck trailer rear of FIG. 1;

FIG. 4 is a partial top view of the truck trailer rear of FIG. 1;

FIG. 5 is a perspective diagram of a deployed aerodynamic assembly for a single door showing the first step typical folding procedure in which the top and bottom horizontal panels are now folded so as to retract the assembly into the underlying spacer frame;

FIG. 6 is a perspective diagram of the arrangement of FIG. 5 showing the top and bottom horizontal panels folded against the frame and the vertical, central/medial panel now in the process of being folded in a subsequent folding procedure step;

FIG. 7 is a perspective diagram of the arrangement of FIG. 5 showing the medial panel now folded over the top and bottom horizontal panels and the medial panel overlying them in a folded orientation, with the vertical outer panel being folded in the process of being folded in a final folding step;

FIG. 8 is perspective diagram of the arrangement of FIG. 5 showing all panels now in a fully folded orientation with respect to the underlying spacer frame;

FIG. 9 is more-detailed perspective view of a spacer frame mounting base for the aerodynamic assembly of FIG. 1 with aerodynamic panels removed;

FIG. 10 is a schematic top view showing the folded door panel assemblies with the doors and attached aerodynamic panel assemblies in a closed position and a phantomized open position located against the sides of the trailer;

FIG. 11 is a schematic top view showing the available clearance at an exemplary loading dock when the panels are folded and the doors are in an open position, secured to the sides of the trailer;

FIG. 12 is a fragmentary perspective view of an exemplary truck/trailer cargo door hinge according to the prior art;

FIG. 13 is a multi-piece, dual-pivot hinge assembly for use with the aerodynamic panel assemblies in accordance with this invention;

FIG. 14 is a fragmentary top view showing a door assembly with an aerodynamic arrangement in accordance with an embodiment of this invention in a closed position;

FIG. 15 is a fragmentary top view of the arrangement of FIG. 14 in a half-partially position of approximately 180 degrees;

FIG. 16 is a fragmentary top view of the arrangement of FIG. 14 in a fully opened position of approximately 270 degrees;

FIG. 17 is side view of a slotted spacer frame side that allows for variable placement of hinges according to an alternate embodiment;

FIG. 18 is a fragmentary perspective view of an unlocked lower panel moved into an engagement with a lock member of a vertical medial panel in the aerodynamic arrangement of FIG. 1;

FIG. 19 is a fragmentary perspective view of the process of locking the lower panel as shown in FIG. 18 with respect to the vertical medial panel;

FIG. 20 is fragmentary perspective view of the lower panel of FIG. 18 shown in a locked position with respect to the vertical medial panel;

FIG. 21 is a rear view of the truck trailer rear of FIG. 1 again showing the aerodynamic panels in a deployed and locked orientation in accordance with the process shown in FIGS. 18-20;

FIG. 22 is a rear view of the truck trailer rear of FIG. 1 showing the panels in a folded orientation;

FIG. 23 is a fragmentary rear view of a truck trailer rear showing an aerodynamic panel in which the lower panel is located above conventionally-located cargo door lock handles thereby allowing access to the handles for locking and unlocking of doors;

FIG. 24 is a fragmentary rear view of a truck trailer rear showing an arrangement of the cargo door lock handles adapted to allow an aerodynamic panel to be extended to the bottom of the door, while still enabling the door to be locked and unlocked;

FIG. 25 is a fragmentary rear view of a truck trailer rear showing an alternate arrangement of cargo door lock handles that allow panel to be extended near the bottom of each door;

FIG. 26 is a fragmentary rear view of a truck trailer rear showing yet another alternate arrangement in which the cargo door lock handles extend from the bottom of the door, thereby allowing the panel to extend substantially to the bottom of the trailer door assembly;

FIG. 27 is a rear view of an exemplary truck cargo body rear with aerodynamic panels extended to the bottom of the door according to an alternate embodiment;

FIG. 28 is a fragmentary perspective view of the rear of a truck trailer cargo body rear showing an aerodynamic structure in a deployed orientation according to an alternate embodiment that employs an “origami” type folding arrangement;

FIG. 29 is a fragmentary perspective view of the rear of a truck trailer cargo body rear of FIG. 28 showing the origami aerodynamic arrangement in a folded orientation;

FIG. 30 is a perspective view of the folding origami aerodynamic structure for one of the pair of adjacent truck trailer cargo doors according to the embodiment of FIGS. 28 and 29 in a fully deployed orientation;

FIG. 31 is a perspective view of the folding origami aerodynamic structure for one of the pair of adjacent truck trailer cargo doors according to the embodiment of FIGS. 28 and 29 showing the folding procedure from the deployed orientation of FIG. 30;

FIG. 31A is a fragmentary perspective view of a pair of adjoining panels in the origami arrangement of FIG. 30 detailing an exemplary sliding hinge assembly in a fully deployed orientation;

FIG. 31B is a fragmentary perspective view of the pair of adjoining panels in accordance with FIG. 31A detailing the operation of the exemplary sliding hinge assembly during a panel folding/collapsing process;

FIG. 32 is a more detailed perspective view showing the central stiffener bar/brace used for deploying and securing the unfolded origami aerodynamic arrangement as shown in FIG. 30;

FIG. 32A is a plan view showing exemplary dimensions for an outer vertical aerodynamic panel according to an embodiment of the origami arrangement of FIGS. 28-32;

FIG. 32B is a plan view showing exemplary dimensions for the central/medial vertical aerodynamic panel section according to an embodiment of the origami arrangement of FIGS. 28-32;

FIG. 32C is a plan view showing exemplary dimensions for the upper, adjoining central/medial vertical aerodynamic panel section according to an embodiment of the origami arrangement of FIGS. 28-32;

FIG. 32D is a plan view showing exemplary dimensions for the adjoining lower central/medial vertical aerodynamic panel section according to an embodiment of the origami arrangement of FIGS. 28-32;

FIGS. 32E and 32F are each respective plan views showing exemplary dimensions for the two adjoining top horizontal aerodynamic panel sections according to an embodiment of the origami arrangement of FIGS. 28-32;

FIGS. 32G and 32H are each respective plan views showing exemplary dimensions for the two adjoining bottom horizontal aerodynamic panel sections according to an embodiment of the origami arrangement of FIGS. 28-32;

FIG. 33 is a partial top view of a conventionally mounted truck trailer cargo door without aerodynamic structures according to the prior art;

FIG. 34 is a top view of a folding aerodynamic structure in accordance with any of the embodiments contemplated herein, which seats within a recess of a modified door, shown in a deployed orientation;

FIG. 35 is a top view of the folding aerodynamic structure of FIG. 34 in a folded orientation in which it lays flushly against, or below, the surrounding outer surface of the recessed door;

FIGS. 36 and 37 are schematic side views of a truck having a trailer that includes a folding aerodynamic structure in accordance with the embodiments of this invention in each of a retracted and deployed orientation, respectively using automated techniques, typically while the truck is in motion;

FIG. 38 is a fragmentary top cross section of a door assembly with attached aerodynamic structure showing an actuator secured to the medial panel that enables the unfolding of the aerodynamic structure according to an embodiment of this invention from the depicted folded state;

FIG. 39 is a more detailed side view of the actuator of FIG. 38;

FIG. 40 is a top view of the folding aerodynamic structure of FIG. 38 showing the aerodynamic structure fully deployed in response to bias force from the actuator of FIGS. 38 and 39;

FIGS. 41 and 42 are rear views of the automated aerodynamic structure of FIG. 38 in each of a folded/retracted and deployed orientation, respectively;

FIG. 43 is an exposed rear view of the truck trailer rear of FIGS. 36 and 37 showing the positioning of the actuators of FIG. 38 upon the underlying cargo doors;

FIG. 44 is a rear view of the truck trailer rear of FIGS. 36 and 37 showing an alternate positioning of an actuator in accordance with this invention;

FIG. 45 is a fragmentary top cross section of a door assembly with attached aerodynamic structure showing an actuator secured to the outer panel that enables the unfolding of the aerodynamic structure according to an embodiment of this invention from the depicted folded state;

FIG. 46 is a top view of the folding aerodynamic structure of FIG. 45 showing the aerodynamic structure fully deployed in response to bias force from the actuator;

FIG. 47 is a rear view of a truck trailer cargo body rear according to an alternate embodiment, having aerodynamic structures separately hinged to the cargo door frame, shown in a closed orientation;

FIG. 48 is a partial side cross section of the truck trailer door and aerodynamic structure taken along line 48-48 of FIG. 47;

FIG. 49 is a rear view of the truck trailer cargo body of FIG. 47 showing the aerodynamic structures hingedly moved to an opened orientation and secured against the trailer sides so as to reveal a rolling cargo door;

FIG. 50 is a rear perspective view of a geared hinge assembly for preventing racking of a door and/or spacer frame having an aerodynamic structure mounted thereon, according to an illustrative embodiment of this invention;

FIG. 51 is a frontal perspective view of the geared hinge assembly of FIG. 50;

FIG. 52 is a top perspective view of the geared hinge assembly of FIG. 50;

FIG. 53 is a perspective view of an intermediate geared spacer clevis and hinge strap for use in the hinge assembly of FIG. 50;

FIG. 54 is a perspective view of a dual-pivot-axis central extension link for use in the geared hinge of FIG. 50;

FIG. 55 is a perspective view of a geared hinge cap and cargo body hinge clevis for use in the geared hinge assembly of FIG. 50;

FIG. 56 is a top view of the geared hinge assembly of FIG. 50 shown in a closed orientation;

FIG. 57 is a top view of the geared hinge assembly of FIG. 50 shown in a partially opened orientation;

FIG. 58 is a top view of the geared hinge assembly of FIG. 50 shown in a fully-opened, 270-degree orientation;

FIGS. 59-61 are each top views of the geared hinge cap of the geared hinge assembly of FIG. 50 showing various positions for the adjustable gear cam;

FIG. 62 is a partial perspective view of the rear of an exemplary trailer having an aerodynamic panel assembly with a swing arm-based deployment and folding system, shown in a folded orientation according to an embodiment of this invention;

FIG. 63 is a partial perspective view of the aerodynamic panel assembly of FIG. 62 in which the panel assembly is beginning to deploy in response to rotation of the swing arm;

FIG. 64 is a partial perspective view of the aerodynamic panel assembly of FIG. 62 in which the panel assembly is further deployed in response to rotation of the swing arm;

FIG. 65 is a partial perspective view of the aerodynamic panel assembly of FIG. 62 in which the panel assembly is fully deployed in response to rotation of the swing arm;

FIG. 66 is a perspective view of the rear of an exemplary trailer having an aerodynamic panel assembly with a folding medial panel deployment and folding system, shown in a partially deployed orientation according to an embodiment of this invention;

FIG. 67 is a perspective view of the aerodynamic panel assembly of FIG. 66 in which the panel assembly is further deployed in response to unfolding of the medial panels;

FIG. 68 is a perspective view of the aerodynamic panel assembly of FIG. 66 in which the panel assembly is nearly completely deployed in response to unfolding of the medial panels;

FIG. 69 is a perspective view of the aerodynamic panel assembly of FIG. 66 in which the panel assembly is fully deployed in response to unfolding of the medial panels, with the medial panels placed in a flush, confronting relationship;

FIG. 70 is a fragmentary side view of a hydraulic/pneumatic-based upper and lower panel deployment and folding system in an aerodynamic assembly, showing the lower panel and associated master cylinder, according to an embodiment of this invention;

FIG. 71 is a fragmentary side view of a hydraulic/pneumatic-based upper and lower panel deployment and folding system, showing the upper panel and associated slave cylinder, which responds to movement of the master cylinder of FIG. 70, according to an embodiment of this invention;

FIG. 72 is a side view of a portion of an aerodynamic assembly having a cable-interconnected upper and lower panel deployment and folding system according to an embodiment of this invention;

FIG. 73 is a side view of a portion of an aerodynamic assembly having an eccentric linking bar-interconnected upper and lower panel deployment and folding system according to an embodiment of this invention;

FIG. 74 is a fragmentary top cross section of the hinge area of a door and aerodynamic assembly with an extended hinge member according to an embodiment of this invention;

FIG. 75 is a fragmentary top view of a hinge area and exemplary having a pivot axis point located along a directly rearward to a directly sideward arc, spaced from a conventional butt hinge pivot axis point;

FIGS. 76-78 are fragmentary top views of a four-bar linkage hinge assembly mounted between a trailer frame and a door with aerodynamic assembly that swings in approximately a 270-degree arc between a closed position, and intermediate position and a fully open position, according to an embodiment of this invention;

FIG. 79 is a fragmentary top cross section of the hinge area of a door and aerodynamic assembly with a conventional butt hinge and extended door hinge member that repositions the door itself further into the trailer cavity, according to an embodiment of this invention;

FIGS. 80 and 81 are respective side cross section and rear views of a outward-folding panel arrangement for a rear-mounted aerodynamic assembly according to an embodiment of this invention shown in a folded orientation;

FIG. 82 is a fragmentary top view of a trailer door and mounted aerodynamic assembly according to an illustrative embodiment having an angled stacking arrangement during folding to clear conventional door locking rods, shown with the aerodynamic assembly folded and the trailer door closed;

FIG. 83 is a fragmentary top view of the trailer door and mounted aerodynamic assembly according to FIG. 82, shown with the aerodynamic assembly folded and the trailer door fully open;

FIG. 84 is a fragmentary top view of the trailer door and mounted aerodynamic assembly according to the embodiment of FIG. 82 showing a remotely placed hinge pivot that enables a panel of the aerodynamic assembly to deploy into a flush relation with the trailer outer side, with side panel shown in a deployed position;

FIG. 85 is a fragmentary top view of the trailer door and mounted aerodynamic assembly according to FIG. 84, with side panel shown in a folded position;

FIG. 86 is a fragmentary perspective view of the rear of a trailer with a door and mounted aerodynamic assembly according to FIG. 82, shown with an upper panel in a deployed orientation and having an angled hinge line for clearance of an externally mounted door locking rod upon folding;

FIG. 87 is a fragmentary perspective view of the rear of a trailer with the door and mounted aerodynamic assembly according to FIG. 86, showing the upper panel beginning to fold downwardly and exhibiting a differential in clearance across its width with respect to the surface of the door;

FIG. 88 is a fragmentary perspective view of the rear of a trailer with the door and mounted aerodynamic assembly according to FIG. 86, showing the upper panel folded further downwardly, and exhibiting a further differential in clearance across its width with respect to the surface of the door;

FIG. 89 is a fragmentary perspective view of the rear of a trailer with the door and mounted aerodynamic assembly according to FIG. 86, showing the upper panel folded fully and exhibiting the desired differential clearance across its width with respect to the surface of the door so as to provide clearance for the externally mounted door locking rod;

FIG. 90 is a perspective view of a frame-mounted hinge member having an extended pivot point for use with the door and aerodynamic assembly according to FIG. 82 and for providing a streamlined panel attachment according to this invention;

FIG. 91 is a fragmentary perspective view of the rear of a trailer with attached side panel of an aerodynamic assembly having hinge members according to FIG. 90 that define a streamlined profile between the trailer side and the adjacent side panel;

FIG. 92 is a fragmentary top cross section of a trailer door and an attached side panel hinge assembly showing a spacer that allows for variable mounting of the hinge assembly;

FIG. 93 is a fragmentary front cross section of a medial region between adjacent aerodynamic upper or lower panels showing a pair of medial wipers in a sealing engagement within a gap between the panels;

FIGS. 94 and 95 show a modified door-locking assembly in which the vertically translating locking rods move, respectively from an unlocked to a locked position in response to rotation of an external handle according to an illustrative embodiment;

FIG. 96 is a fragmentary perspective view of a rear-mounted aerodynamic panel assembly with surface mounted upper lighting assemblies according to an illustrative embodiment;

FIG. 97 is a fragmentary perspective view of a rear-mounted aerodynamic panel assembly having a header assembly with flush-mounted upper lighting assemblies according to an illustrative embodiment; and

FIG. 98 is a fragmentary perspective view of a rear-mounted aerodynamic panel assembly with transparent/translucent sections to expose conventionally located trailer frame mounted upper lighting assemblies according to an illustrative embodiment;

FIG. 99 is a rear perspective view of a fully deployed aerodynamic assembly mounted on one trailer door according to an illustrative embodiment of this invention, and employing a swing arm-type upper and lower panel deployment system;

FIG. 100 is a more detailed perspective view of the lower panel locking mechanism for the deployed aerodynamic assembly of FIG. 99 detailing a locked relationship between the lower panel and the side or lateral panel;

FIG. 101 is a more detailed perspective view of the locking mechanism of FIG. 100 showing the unlocking of the panels from each other;

FIG. 102 is a more detailed perspective view of the locking mechanism of FIG. 100 showing the unlocked panels being moved further away from each other, and toward a folded/retracted position;

FIG. 103 is a more detailed perspective view of the aerodynamic assembly of FIG. 99 showing the now-unlocked panels moving further toward a folded/retracted position;

FIG. 104 more detailed, fragmentary rear view of the aerodynamic assembly of FIG. 99 showing the folding hinge arrangement for the upper aerodynamic panel;

FIG. 105 is a more detailed perspective view of the folding hinge arrangement of the upper aerodynamic panel of FIG. 99;

FIG. 106 is a more detailed top view of the upper aerodynamic panel and side/lateral panel of FIG. 99 in a folded orientation shown providing clearance for a door lock rod;

FIG. 107 is an exploded perspective view of a door hinge unit for use in the door and aerodynamic panel assembly of FIG. 99;

FIG. 108 is a perspective view of an assembled door hinge unit according to FIG. 108;

FIG. 109 is an assembled door hinge unit according to FIG. 108 further including a lateral panel hinge nested therein with it's own discrete pivot axis provided by the hinge unit;

FIG. 110 is a more detailed fragmentary top view of the aerodynamic panel assembly of FIG. 99 shown with the panels in a folded position and the door in a fully closed orientation against the door frame of the trailer;

FIG. 111 is a more detailed respective view of the folded panel assembly of FIG. 99 with the door moved to an opened position upon the hinge units shown in FIGS. 107 to 109;

FIG. 112 is a more detailed top view of the folded panel assembly of FIG. 99 showing the door and panel assembly moved to a fully opened, 270-degree orientation upon the hinge units shown in FIGS. 107-109, and placed substantially flushly against the side of the trailer body;

FIG. 113 is an exploded perspective view of the trailer-frame-mounted, elongated hinge butt plate having variably placed hinge locations that enable customization of the unit according to the illustrative embodiment of FIG. 99;

FIG. 114 is a fragmentary perspective view of the hinge butt plate of FIG. 113 installed along the edge of the trailer door frame with a new hinge butt defined by the butt plate overlying an existing trailer hinge;

FIG. 115 is a fragmentary top perspective view of the deployed aerodynamic assembly of FIG. 99 showing the positioning of a cutout on the medial filler strip of the upper aerodynamic panel to enable a trailer door lock rod to pass therethrough;

FIG. 116 is a perspective view of a length-adjustable tie-rod for adjustably interconnecting each of the upper and lower aerodynamic panels of the aerodynamic panel assembly of FIG. 99 to the swing arm assembly;

FIG. 117 is a partial perspective view of the rear end of a truck trailer body including a rear-mounted aerodynamic assembly in an unfolded/deployed orientation according to an illustrative embodiment;

FIG. 118 is a partial perspective view of the rear end of FIG. 117 showing the aerodynamic assembly in a folded/retracted orientation;

FIG. 119 is a rear view of the truck trailer body of FIG. 117 showing the aerodynamic assembly in the deployed orientation;

FIG. 120 is a rear view of the truck trailer body of FIG. 117 showing the aerodynamic assembly in the retracted orientation;

FIG. 121 is a partial perspective view of a single, right-hand door of a truck trailer body of FIG. 117 showing the associated right half of the aerodynamic assembly in the deployed orientation, the unshown left half being a mirror image thereof;

FIG. 122 is a top view of the right half of the aerodynamic assembly of FIG. 121;

FIG. 123 is a side view of the right half of the aerodynamic assembly of FIG. 121;

FIG. 124 is an exploded view of the right half of the aerodynamic assembly of FIG. 121 showing panels, living hinges for joining panels and panel edge stiffeners according to the illustrative embodiment;

FIG. 125 is a side view of a swing arm assembly for coordinating movement of the panels of the aerodynamic assembly of FIG. 121;

FIG. 126 is a partial perspective view of the right-hand door of the truck trailer body of FIG. 121 showing a portion of the bottom panel of the right half of the aerodynamic assembly attached thereto;

FIG. 127 is a partial perspective view of a right-hand door of a truck trailer body according to an alternate embodiment, which includes two, side-by-side lock rods per door, showing the weather seal of adaptation of the bottom panel to accommodate those two lock rods;

FIG. 128 is a side perspective view of the right-hand door and associated right half of the aerodynamic assembly of FIG. 121 in a folded/retracted orientation, further detailing the stacking relationship between interconnected panels;

FIG. 129 is a fragmentary rear view of the door and aerodynamic assembly of FIG. 121 showing the angled hinge axis defined by the top and bottom panel hinges with respect to the door to facilitate flush folding of the panel assembly;

FIG. 130 is a fragmentary perspective view of the side panel and bottom panel of the right half of the aerodynamic assembly, according to an illustrative embodiment, showing a latching mechanism for securing the assembly in a folded orientation;

FIG. 131 is a fragmentary perspective view of the side panel and bottom panel of the right half of the aerodynamic assembly, according to an alternate embodiment, in which the bottom panel is defined by an open framework so as to avoid accumulation of snow and debris thereon; and

FIG. 132 is an exposed partial side view of a vehicle body rear having a non-swinging, roll-up door, and employing an aerodynamic assembly according to an alternate embodiment using a secondary, overlying door plane or framework, which is hingedly mounted to the vehicle rear.

DETAILED DESCRIPTION

An exemplary truck trailer section 100 is shown in FIG. 1. The cab has been removed in this depiction for further clarity, but can be any acceptable size, model, type and configuration of motorized unit. It can be assumed that this cab includes appropriate roof and side aerodynamic structures to enhance the overall aerodynamic efficiency of the assembled truck. In accordance with an embodiment of this invention the trailer section includes, at its rear end 102, an aerodynamic structure 104 consisting of four inwardly tapered aerodynamic surfaces or panels 106, 108, 110 and 112. The surfaces/panels are formed from rigid, semi-rigid or somewhat-flexible sheet material that, as will be described further below, can be folded along hinge lines, or otherwise retracted, to allow access to the doors 120 that are mounted on the back 102. The thickness and perimeter shape of the panels is highly variable. In an exemplary embodiment, the panels can be formed from a lightweight metal, like aluminum alloy or a synthetic composite, such as fiberglass or carbon-fiber composite. They panels should be able to withstand high winds experienced at highway speeds without excessive flapping or vibration. Internal stiffeners or ribs can be provided where appropriate. The panels have an exemplary thickness along their mid-regions of between approximately ⅛ inch and ¼ inch—but lesser or greater thicknesses are expressly contemplated. The overall structure extends rearwardly approximately four feet from the back of the trailer in the embodiment, but other distances of extension are expressly contemplated.

Referring to FIGS. 2-4, the rear or back 102 of the trailer cargo body 100 is shown in further detail. Referring first to the side view in FIG. 2, the top horizontal aerodynamic panel 110 and bottom horizontal aerodynamic panel 112 span between the illustrated external, right side vertical aerodynamic panel 106. A similar left side vertical aerodynamic panel 208 is also provided. Referring further to FIGS. 3 and 4, the top and bottom horizontal panels 110 and 112 each comprise a pair of adjacent right/left panels 310, 312, and 320, 322, respectively. In this manner, one half of the upper panel and the lower panel is attached to each door 330, 332 respectively. A pair of central or medial vertical panels 340 and 342 extend between respective top and lower panel sections 310, 320 and 312, 322 respectively. Thus, each door has attached thereto and individual tapered box-like aerodynamic assembly/structure. FIG. 5 describes one of these exemplary, individual aerodynamic structures 510 in further detail.

As shown in FIG. 5, the four aerodynamic panels 310, 320, 106 and 340 are all hingedly attached to a rectangular spacer frame 520 that acts as a fixed mounting base. The spacer frame 520, as will be described below, includes hinges along each of four sides that allow each of the panels hingedly attached aerodynamic panels to be folded inwardly toward the spacer frame. As shown in FIG. 5, an aerodynamic panel can be moved from the depicted deployed position to a folded, retracted position. In this example, the folding process begins by first folding inwardly the upper horizontal panel 310 and the bottom horizontal panel 320 as shown by arrows 560. While a spacer frame is employed in this exemplary embodiment, in illustrative embodiments described further below the stackup of folded panels can be reduced and other benefits can be achieved without the use of a spacer frame.

Referring next to FIG. 6, the upper and lower panels 310 and 320 are now folded within the spacer frame 520, thereby allowing the medial vertical panel 340 to be folded inwardly as shown (arrow 650). In FIG. 7, the medial vertical panel 340 is now folded-in to overlie the upper and lower horizontal panels 310 and 320. Now the outer vertical panel 106 can be folded inwardly (arrow 750) to overlie the inner vertical panel 340. The final folded structure is shown in FIG. 8 with all panels essentially nested within the spacer frame 520.

Note that a medial “panel” is shown and described for each folding aerodynamic structure herein. While the depicted panel is a solid planar member, the term “panel” as used herein should be taken broadly to include other types of interior supporting members that may not fully, or substantially, close-off the space between the two adjacent aerodynamic assemblies on the adjacent doors. For example, the medial panel (which can also be termed a “splitter” can comprise a beam, or an open trusswork). Since this component is not within the airstream, it can take any form that is sufficient to support the inside corners of the top and bottom horizontal panels.

Referring to FIG. 9, the depth DSF1, DSF2 and DSF3 of each side of the spacer frame 520 is chosen so that the panels neatly overlie each other without binding in the desired folding order. To facilitate this folding order, the upper and lower/bottom horizontal spacer frame sides 910 and 912 are located lowest (DSF2), the medial vertical spacer frame side 914 is slightly higher (DSF3), and the outer vertical spacer frame side 916 is the highest side (DSF1). Since the upper and lower panels do not overlap in the folded orientation, their sides 910 and 912 are the same height (DSF2) in this embodiment. Each spacer frame side includes hinge brackets 930 that interconnect with corresponding hinges on the adjoining folding aerodynamic panels. The spacer frame sides also include mounting plates 940 (or another acceptable mechanism) to allow them to be secured to the flat face of a conventional, underlying door (120). The mounting plates 940 in this embodiment include holes for allowing fasteners to be passed therethrough and into the door. The upper and lower horizontal spacer frame sides 910 and 912 also include through-holes or slots 950 that are sized and arranged to allow clearance for the passage of conventional exterior cargo door locking rods 960, the use and construction of which should be well-known to those known in the art. These locking rods 960 particularly facilitate the locking of each door against the trailer cargo body. As will be described below, a mechanism that allows the driver to access the locking rod handles is desirable. In the depicted embodiment, the bottom horizontal panel 112 is elevated above the bottom of the door section to create an open space 348 (see, for example, FIG. 3). This open space can be used to access the handles, which are typically located slightly above each rod's pivot base 370. As will be described further below, alternate mechanisms for allowing actuation of the locking rods 960 can be employed, thereby allowing the aerodynamic structure to extend down to the bottom region of the door section. Note, even when suspended above the bottom of the door, each depicted aerodynamic assembly in this embodiment affords a significantly improved aerodynamic profile to the rear of the trailer.

In this embodiment, the angle of taper (angle AT in FIG. 4) for the sides (and the top and bottom) can be between approximately seven degrees and twenty degrees. The precise taper angle is highly variable, and can be determined (in part) by exposing the particular trailer shape and configuration to wind tunnel tests and/or other well-known aerodynamic testing techniques. As shown particularly in FIG. 8 when folded the vertical panels 106 and 340 each display a characteristic downward angle along the top edge 880 and 882, respectively due to the horizontal upper panel's taper.

While the spacer frame 520 is depicted as a series of thin, upright plates, in alternate embodiments, it can be a set of lower, flattened beams, with fasteners passing directly through the faces of the beams (as opposed to separate L-shaped mounting plates 940 as shown).

When folded, as shown generally in FIG. 8, each door's respective aerodynamic assembly in accordance with this embodiment presents a relatively low profile that compactly overlies its respective door. As shown further in FIG. 10, each folded aerodynamic structure 1010 and 1012 can be hinged approximately 270 degrees into the fully opened depicted orientation (as shown in phantom) so that the door and overlying aerodynamic assembly are collectively secured against the sides 1020 and 1022, respectively of the trailer cargo body 100.

As shown in FIG. 11, this compact folding arrangement, thus allows a trailer cargo body 100 to be readily backed (arrow 1110) into a conventional loading dock bay 1120 with its doors opened and secured in a conventional manner, and free of interference with adjacent, closely spaced trailers 1130 and 1140, which may be already positioned at the dock as shown, or subsequently maneuvered into and out of the dock. Hence, the folding arrangement of this embodiment affords the driver and/or loading dock personnel an easy and conventional technique for maneuvering the vehicle and for opening trailer doors to gain full, unobstructed access to the trailer's cargo compartment.

In order to facilitate the hinged movement of the substantially thickened door and aerodynamic structure (1010 and 1012), a conventional hinge cannot be employed. The additional thickness provided by the space frame (between approximately three and eight inches of additional thickness in various embodiments-depending in part upon the height of the spacer frame and folded panel components) would cause the corner of the spacer frame to bind against the truck side after only 180-200 degrees of opening movement. By way of illustration, and as shown in FIG. 12, a conventional truck door hinge consists of a clevis 1210 that is secured to the trailer's door frame 1220 using fasteners, welding or another technique. A pin 1230 passes through the clevis and provides a pivot point for a stamp section 1240 that extends onto the door surface 1250, and is attached to the door (1250) by fasteners 1260. This hinge structure allows the relatively thin conventional door to swing around and lay flatly against the sides of the trailer. However, a significantly outwardly thickened door could not lay flat against the sides and, instead, would bind up on the sides before fully swinging around as described above. This would interfere with loading and unloading, and more particularly would interfere with adjacent trailers at the dock. Thus, as shown in FIG. 13, a modified, multi-part hinge assembly 1310 is employed with the door and aerodynamic panel assembly of this embodiment.

The trailer's original clevis (or a modified clevis) 1320 is used in connection with the trailer's door frame. The clevis 1320 is connected by a pivot pin 1332 to the first side 1334 of a central clevis 1330. This central clevis 1330 extends the overall swing range of the hinge assembly to allow for the thicker door. The opposing side 1344 of the central clevis 1330 is joined by another pin 1342 to the strap assembly 1340 that is secured to the door and spacer frame. Each pin 1332, 1342 can be secured in place by a respective head 1350 and opposing threaded nut 1352. A strap assembly 1340 includes a pivoting base 1360 that engages the pin 1342 and an L-shaped strap plate 1362. The strap plate includes fastener holes 1364 or another mechanism for securing it to the door and aerodynamic assembly.

With reference now to FIGS. 14-16, the operation of the hinge assembly 1310 is shown in further detail. In FIG. 14, the clevis 1320 is attached to the door frame 1410 of the trailer body with the original door 1420 in a closed position. There may be a variety of gaskets and/or other seals within the gap 1430 between the door 1420 and the frame 1410. These have been omitted for clarity. The door 1420 is attached to the outer spacer frame side 916 by fasteners 1450 (shown in phantom), or another securing mechanism. Similarly, the spacer frame side 916 (as well as other parts of the spacer frame 520) is attached securely to the face of the door 1420. In alternate embodiments, a further L-shaped hinge strap section 1460 (shown in phantom) can be provided at the end of the strap 1362. This section 1460 can pass under a portion of the spacer frame side 916 and be attached directly to the door face for further security.

As shown in FIG. 14, in the closed position the base clevis 1320 and central clevis 1330 are in alignment along a center line 1470 that runs between parallel pivot axes 1478 and 1480 for each respective pivot pin 1332, 1342. By employing the central clevis 1330, the pivot point 1480 for the strap section 1362 has been extended outwardly from the door frame edge 1410 by an additional distance DE relative to the original pivot point's (1478) extension distance DO. This additional distance DE is designed to compensate for the thickness TS of the aerodynamic structure.

Thus, referring now to FIG. 15, when the door assembly is opened, the strap 1362 and central clevis 1330 rotate about the pin 1332 of the base clevis 1320. The added extension provided by the central clevis causes the pivot point 1480 of the pin 1342 to extend beyond a distance DP with respect to the face of the trailer side wall 1510.

As such, when the overall door assembly is swung fully around on the pivot 1480 (270 degrees, as shown in FIG. 16), the aerodynamic structure is separated by a gap SD relative to the side of the trailer 1510. In this orientation, the door 1420 is positioned at a significant distance from the trailer side 1510, with the spacer frame 916 disposed in the intervening space. The length LSS of the strap section 1620 that is mounted along the side 916 is equal to or greater than the length of the longest side of the frame (520). This dimension and the placement of the central clevis pivot 1480 determine the appropriate spacing for the door assembly relative to the trailer side. These dimensions can be adjusted based upon the over thickness of the organic assembly. While not shown, the end of each assembly includes a hook or other fastening mechanism that allows the overall door to be secured against the side 1510 without unwanted release. This ensures that the doors do not inadvertently flop back, and possibly strike an adjacent trailer, as the vehicle is backed into a loading position. Note also that the central clevis includes a shoulder 1630 that is sized and arranged to bear against the base clevis side 1640 when the central clevis is pivoted to a maximum position. This maximum pivot position is typically at a ninety degree angle with respect to the original pivot alignment line 1470 (FIG. 14).

It is generally contemplated that, where possible, the truck's original clevises will be employed in a retrofit application of the aerodynamic structure of this invention. Thus, in such a retrofit application, a custom central clevis, or a central clevis that includes appropriate spacers, is provided as a replacement for the original strap member. However, the vertical placement and/or number of hinges on a given trailer door is highly variable among various manufacturers. To allow for a standard aerodynamic structure that can be retrofit to a variety of vehicles, an embodiment of a “universal” spacer frame outer side member 1710 is shown in FIG. 17. This adjustable side member can include a series of slots 1720 along its length at appropriate locations to receive fasteners 1450 from the modified hinge strap plate 1362. By carefully locating and sizing slots, a variety of conventional trailer door hinge placements can be accommodated without need of providing a customized aerodynamic spacer frame.

When folded together, the vertical panels can be secured together by any acceptable mechanism to maintain the folded shape. For example, a strap, or catch assembly can be provided between the spacer frame and the edge of each respective outer vertical panel. And when fully deployed, a secure mechanism for maintaining the panels in this deployed orientation is also provided. Given the prevailing aerodynamic pressures experienced by the deployed assembly at high speed, the locking mechanism for the deployed orientation should resist detachment of panels.

With reference to FIGS. 18-20 the sequence for locking of vertical and horizontal panels in place is shown in detail. The unlock sequence is, of course, the reverse of the depicted locking sequence.

Referring first to FIG. 18, the central/medial vertical panel 340 is shown in deployed orientation, facing perpendicularly with respect to the back face of the door (not visible). The medial vertical panel 340 includes a projecting locking base 1810 with an outer strap 1820 and an inward slot 1822. The detached horizontal lower panel 320 includes a corresponding locking plate 1830 with a small tongue 1832 that is sized and arranged to pass through the slot 1822 as the panel 320 is moved downwardly (arrow 1840) into engagement with a locking base 1810. When the plate 1830 has been secured against the locking base 1810, as shown in FIG. 19, an rotating rod 1910, mounted on the vertical edge of the medial panel 340 is rotated 1920 using a locking handle 1922. The rotation (arrow 1920) causes an overlying block 1930 to move into position over the top face 1940 of the plate 1830. As shown further in FIG. 20, the block 1930 now overlies the top face 1940 of the plate 1830, thereby preventing upward movement of the panel 320 with respect to the vertical panel 340. An appropriate locking strap or catch (not shown) can then be used to secure the handle 1922 against the panel 340 so that the assembly remains intact until released. Similar locking assemblies can be provided at each junction between a vertical panel and a horizontal panel. Thus, this structure and locking procedure is applied to each corner of the aerodynamic panel assembly. In particular the rotating locking rod 1910 engages blocks at both the adjoining horizontal top and lower panels simultaneously.

Note that the depicted horizontal and vertical panels can be deployed by manually, by physically drawing them into the deployed orientation, and then undertaking the above-described locking procedure. Alternatively, automated mechanisms that may include springs and actuators can be used to deploy panels. Similarly panel-assembly locks can be applied through manual or automatic techniques.

By way of comparison, the panels 106, 108, 310, 312, 320 and 322 are shown fully deployed in FIG. 21 with the center parts of each of the doors 330 and 332 exposed. By unlocking the panels as described above, and folding, first the horizontal panels 310, 312, 320 and 322, and then the vertical panels 106, 340, 108 and 342, the folded assembly assumes the compact appearance as shown in FIG. 22. As noted above, an appropriate strap or other locking assembly can be used to maintain the panel's folded orientation on each door assembly. Since each door's panel assembly is completely separate from the other, each door may swing open as described above on the modified hinges.

As also described above, and with further reference to FIG. 23, the base frame 520 is shown attached to the door 330. The door locking rods 960 extend through the horizontal base frame side 912 at the bottom of the assembly as shown. As noted above, because the conventional door handles 2310 extend at a distance DH from the bottom edge 2320 of the trailer 100, the bottom spacer frame side 912 is positioned above the handles 2310. This allows the user access to the handles when the aerodynamic structure is folded. However, in alternate embodiments, the locking rods 960 can be actuated by modified handles as shown in FIG. 24 which allow for lowering of the bottom frame side 2450 (shown in phantom). The modified handles 2410 extend from the original handle mounting pivots 2420 on the rods 960, but include and elongated downward extension 2430 that positions the handles below the now-lowered frame side 2450. Appropriate slots can be formed in the frame sides to allow the handles 2410 to swing around their full 180-degree arc. In this manner, the user can grasp handle extensions 2460 that are now located beneath the frame side 2450 to open the corresponding door.

In another embodiment, the handle bases can be moved as shown in FIG. 25. The bases 2510 are thus located below the lowered horizontal frame side 2520 so that the handle extensions 2530 reside near the bottom 2540 of the trailer. As shown further in FIG. 26, where multiple locking rods are employed, the handles 2610 can extend below the bottom 2620 of the horizontal frame member and the multiple locking rods 2630 can be rotatably linked by a pushrod-and-clevis linkage assembly 2640. In this manner, when the handle 2610 is rotated, it rotates each of the rods 2630. As shown in FIG. 27, the trailer 100 is provided with lowered horizontal panels 2710 and 2712, and associated vertical side panels 2730, 2732, 2740 and 2742 as a result of the downward movement of the door lock handles 2750. It should be clear that a variety of straightforward approaches can be employed to allow access to the trailer's door locking mechanism while affording an efficient shape for the aerodynamic structure according to this invention.

The above-described panel embodiment, using separate panels that are each separate from each other and locked together upon deployment, provides a simple and effective structure for creating a tapered aerodynamic tail section on a trailer's cargo door assembly. However, in some instances, the movement of multiple panels and their locking/unlocking may prove cumbersome. Therefore, FIG. 28 details an alternate embodiment for a truck aerodynamic structure that is based on an “origami” type folding principle. That is, the folding of the central/medial vertical panel causes the remaining, fully interconnected aerodynamic panel structure to fold together into a final folded form in a predetermined order.

As shown in FIG. 28, the above-described trailer cargo body 100 has been provided with an aerodynamic structure 2800 that consists of two individual door assemblies 2810 and 2812 attached to each of two respective underlying hinged cargo doors. Each aerodynamic assembly 2810 and 2812 comprises a set of individual panels that fold along accurately placed and oriented adjoining hinge lines. That is, each top horizontal panel 2810 and 2812 consists of a pair of foldable upper panel sections 2820, 2822 and 2830, 2832 respectively. Likewise, each bottom horizontal panel 2840 and 2842 consists of corresponding folding sections 2850, 2852 and 2860, 2862 respectively. In this embodiment, the outer side panels 2870 and 2872 are single-piece units for maximum rigidity and strength. The two confronting medial vertical panels 2880 and 2882 each consist of three separate folding sections 2884, 2886, 2888 and 2890, 2892, 2894, respectively.

Referring to FIG. 29, in a folded orientation, the aerodynamic structure lies flatly against the respective doors 330 and 332 to allow these doors to be opened, and secured against the sides 1510 of the trailer 100 in a manner generally described above for the separate, lockable panels. A version of the modified hinge assemblies 1310 are described above are employed in order to facilitate opening of a thickened overall door structure to its full degree.

Referring now to FIG. 30, the operation of one of the “origami” type aerodynamic structures (2810) is shown in further detail. It should be noted that the structure resides on a spacer frame 3010 that is similar in size, shape and relative standoff (e.g. different heights for different frame sides) as the above-described frame base. In this embodiment the sizing of heights for each side of the spacer frame 3010 is chosen to allow each of the four overall panels 2870, 2810, 2840 and 2880 to properly overlap each other in the final folded orientation.

With reference also to FIG. 31, the structure and function of the origami-type aerodynamics structure is described in further detail. The central or medial vertical panel 2880 hinges along its base line 3110 with respect to the spacer frame 3010 as shown. In this manner, the main/center medial panel section 2086 moves inwardly and outwardly, causing the upper and lower panel sections 2884 and 2888 to hinge along the adjoining medial panel hinge lines 3112 and 3114. This movement, in turn, causes the adjoining top and lower panel sections 2820 and 2850 to hinge along the corner hinge lines 2120 and 3122. In addition, the movement of these panel sections 2820 and 2850 causes the adjoining top horizontal panel sections 2822 and 2852 to move along hinge lines 3130 and 3132. Likewise, the hinged one-piece outer vertical panel 2870 is drawn in along hinge lines 3140 and 3142.

When folded, the central medial vertical panel section 2886 is placed closest to the underlying cargo door, followed by the two folded-in adjoining medial upper and lower panel sections 3112 and 3114, respectively. Overlying these medial panel sections are the adjoining upper panel sections 2820 and 2850, followed by the adjoining upper panel sections panels 2822 and 2852. Overlying this folded grouping of panel sections is the outer vertical panel 2870. In this manner, the outer vertical panel 2870, which defines the only one-piece, unitary member in this embodiment, covers the separate, individual folded pieces thereby assisting in protecting them from damage and weathering. A variety of hinge structures can be used to join the panels and panel sections. Strap hinges, or elongated piano-style hinges can be employed. Where possible such hinges should be located on the interior of the panel assembly (when deployed) to protect hinges from the elements and smooth the aerodynamic profile. Flexible tape or an elastomeric sheet (or another flexible material) can be used to cover the outside surface at each hinge line so as to further seal the joint from air and water infiltration. In alternate embodiments, hinge material can be constructed from a durable and high-strength polymer material or a high strength fabric.

Because each panel has a finite thickness, a fixed hinge joint between panels, which displays only one rotational degree of freedom would not allow the unique origami type folding of panels to occur without binding. To compensate for this characteristic non-linear folding, the hinge lines of adjoining horizontal and vertical panels are provided with “planar joints” that exhibit both rotational and translational motion. This is accomplished by providing so-called sliding hinge assemblies 3180 at the hinge lines between horizontal and vertical panels/panel sections. In this embodiment, the intra-panel joints between sections of the same panel (e.g. joints between top sections, joints between bottom sections and joints between medial sections) are provided with fixed rotation-only hinges 3182. These rotation-only hinges can be elongated piano-style hinges or separated hinge units.

Referring to FIG. 31A, a sliding hinge assembly 3180 mounted between exemplary panels 2870 and 2822 along hinge line 3140 is shown. The hinge element 3184 in this embodiment is similar in form to a conventional strap hinge with a butt base that is secured to the panel 2180 by fasteners 3188 and a pivoting strap member 3190. Unlike a conventional hinge, however, the strap member is not directly and fixedly secured to the opposing panel 2870. Rather, the strap member 3190 resides within a loop 3192 that has a gap 3194 with a gap height HGL (relative to the panel surface) that is slightly greater than the thickness TSM of the strap member so as to allow the strap member 3190 to slide within a gap 3194. The length LGL of the gap is also greater than the maximum width WSM of the strap member 3190 to provide limited side-to-side/lateral clearance between the strap member and loop in this embodiment. When the panels are fully deployed, the hinge line is closely conformed by the adjoining panels 2810, 2870, and the strap member of the hinge is directed fully into the loop. The fitment of the panels and accurate placement of the hinges and loops ensures a tight and rigid structure in the deployed orientation.

However, as shown in FIG. 31B when the panels are folded, and rotate about the hinge pivot (curved arrow 3195), the strap member translates in two degrees of translational freedom (arrows 3196 and 3197) as the strap member 3190 slides within the gap as the panels form a separation (double arrow 3198) along their mutual hinge line 3140. In this embodiment, the degree of sliding along the direction of arrow 3196 is approximately 3 inches. This amount varies based upon the relative thickness of the panels and the folding geometry. To avoid inadvertent pullout of the strap member form the loop, the end of the strap member includes a stop. To avoid inadvertent pullout of the strap member 3190 from the loop 3192, the end of the strap member includes a stop 3199 that prevents the strap member from fully passing out of the loop. It should be clear that the above-described configuration for a sliding hinge is only one of a variety of possible designs. The term “sliding hinge” as used herein should be taken broadly to contemplate any hinge geometry that allows rotation, and at least one degree of translational movement between adjoining panels.

In this embodiment, two or more, spaced-apart, discrete sliding hinges (or a single, elongated sliding hinge structure) are mounted along hinge line 3120, 3140, 3142 and 3122, while other hinge lines are served by rotation-only hinges. In alternate embodiments, other sets of hinge lines can be served by sliding hinges.

Referring further to FIG. 31, a simple deployment mechanism for the structure 2810 is shown, consisting of a pull cord 3150 and handle 3152 that are drawn downwardly (arrow 3154) to bias the unit into deployment. The cord 3150 can be locked in place against a stop on the door, or another retaining mechanism can be used to hold the cord taut.

Referring further to FIG. 32, the cord 3150 passes through a hollow stiffener bar 3210 that is physically secured by fasteners or another mechanism to the central medial panel section 2886. The cord is secured to a loop 3220 on one adjoining medial panel section 2884, and slidably passes through a loop 3222 on the other adjoining medial panel section 2888. When the cord is pulled taut (the upper end of the cord being anchored against the loop 3220), it forces the draw bar to bias the central medial panel 2886 into alignment with the two adjoining panels 2884 and 2888. This provides a simple and effective mechanism for deploying the aerodynamic structure as the adjoining upper panel sections and outer panel are thus forces to move outwardly into the deployed orientation. By releasing the cord's tension, the panels can be folded back together, and nested within the spacer frame. A pre-tensioned shock cord, or other form of tension spring assembly can be attached between the central medial panel and cargo door face (or another location, to facilitate folding when cord tension is released. Note, in alternate embodiments, the stiffener bar can be spring loaded against the door, so that release of tension of the cord 3150 automatically brings the aerodynamic structure into a folded orientation

In an illustrative embodiment, the particular geometry that characterizes each of the origami-type panels is as follows:

FIG. 32A shows the one-piece outer vertical panel 2870. In an illustrative embodiment, the overall height HOP of the hinge line 3250 between the spacer frame and the panel 2870 is approximately 94.75 inches. The perpendicular length LOP of the panel is approximately 48 inches. The top taper, defined by the angle ATOP between the spacer frame hinge line 3250 and the hinge line 3140 with the adjoining upper panel is approximately is approximately 75.49 degrees. The bottom taper angle ABOP between the lower panel hinge line 3142 and the spacer frame hinge line 3250 is approximately 83.24 degrees.

FIG. 32B details the layout of the central section 2886 of the overall medial panel. The overall vertical height MPH of the space frame hinge line 3110 is approximately 93.75 inches. The hinge line 3114 between the central section 2886 and the upper medial section 2884 (see FIG. 32C) has a length MPL1 of approximately 54.08 inches. Likewise, the length MPL2 of the lower hinge line 3114 between the central section 2886 and the bottom medial section 2888 (see FIG. 32D) is approximately 67.88 inches. The small thickness 3252 and 3254 at the top and bottom of the central panel section 2886 has a measurement MPT of approximately 2 inches. The depicted angles AMP1 and AMP 2 of the respective hinge lines 3112 and 3114 are 127.5 degrees and 131.5 degrees, respectively. The horizontal width WMP of the panel at its widest point, between the hinge line 3110 and outer edge 3256 is approximately 36 inches.

With reference to FIG. 32C, the upper medial panel section 2884 defines the above-described length MPL1 of 54.08 inches along its common hinge line 3112 with the central media panel 2886. The upper angle AMPU1, between hinge lines 3120 and 3112, is approximately 37.5 inches. The lower edge 3260 has a length MPUT, as shown, of approximately 4.82 inches. The depicted angle AMPU2, at this location is approximately 142.5 degrees. The hinge line 3120, which connects to the upper panel section has a length LPT1 of approximately 48 inches.

With reference to the bottom medial panel section 2888 shown in FIG. 32D, the hinge line 3114, as described above, has a length MPL2 of approximately 49.65 inches. The hinge line 3122, which interconnects with the lower panel section, has a length LBP1 of approximately 48 inches. The upper section 3262 has a length MPLT of approximately 4.69 inches and the depicted angle AMPL1 is approximately 138.5 degrees. The opposing angle AMPL2, between the hinge lines 3114 and 3122, is approximately 41.5 degrees.

The two hinged-together sections 2820 and 2810 of the top horizontal panel are shown, respectively in FIGS. 32E and 32F. In the panel section 2820, the hinge line 3120 has a length LTP1 of approximately 48 inches. Likewise, the spacer frame hinge line 3270 has a similar length LTP1 of approximately 48 inches. The hinge line 3130 that joins to the other, adjoining upper panel section 2810 has a length LTP2 of approximately 67.88 inches. The panel defines a right-angle ATP1 of 90 degrees.

The adjoining upper panel section 2810 has a length LTP2 along its adjoining hinge line 3130 of approximately 67.88 inches. The outer edge 3272 has a length LTP3 of approximately 35.58 inches. The angle ATP2, between the edges 3130 and 3272, is approximately 45 degrees.

Reference is now made to the bottom horizontal panel sections 2840 and 2850, shown respectively in FIGS. 32H and 32G. The panel section 2850, which adjoins the medial panel is shown in FIG. 32G, and includes an adjoining hinge line 3122 with the bottom medial panel section 2888. This hinge line 3122 has the above-described length LBP1 of an approximately 48 inches. Likewise, the spacer frame hinge line 3280 defines a length LBP1 of approximately 48 inches. The lines join at a right angle ABP1 of 90 degrees. The opposite hinge line 3132, which connects with the other lower panel section 2840, has a length LBP2 of approximately 63.54 inches. Referring to FIG. 32H, which shows the other, adjoining lower panel section 2840, the adjoining hinge line 3132 also defines the above-described length LBP2 of approximately 63.54 inches. The outer edge 3282 of the panel 2840 has a length LBP3 of approximately 35.94 inches. The angle ABP3, between edges 3132 and 3282, is approximately 49.06 inches.

It should be noted that each of the above-described dimensions is exemplary and can be varied in order to vary the size, shape, or relative taper of the panels. Dimensions for an aerodynamic structure having a different size, shape and/or taper can be derived using geometric and trigonometric calculations or through trial-and-error, based upon full-size prototypes and small scale models. Accordingly, each of the dimensions described above should be taken as exemplary.

Each of the above-described embodiments utilizes modified hinges (1310 in FIG. 13) that allow for a thickened, outwardly extended door, due to the presence of the base frame and folded aerodynamic panels. In an alternate embodiment, the cargo hinges may remain conventional, and a modified door can be employed. With reference first to FIG. 33, a conventional door assembly 3310 according to the prior art is shown. This door assembly consists of hinge straps 3320 mounted on clevises 3330 that are each secured against the trailer body door frame 3340. The relatively flat door 3350 can be opened to approximately 270 degrees, and secured flushly against the trailer side 3360 as described above.

Conversely, FIGS. 34 and 35, detail modified doors 3410 and 3412 that each includes an inward recess 3420 and 3422, respectively. The recess is sized and arranged so that it allows a pair of aerodynamic structures 3430 and 3432 of an appropriate size and shape to be deployed out of the recesses as shown. When not in use, the aerodynamic structures can be folded into their respective recesses 3420 and 3422 as shown in FIG. 35. Because the surrounding surface 3540 of each door 3410 and 3412 is the maximum outward projection of the door (the folded panels being disposed at or below the surrounding surface). Thus, as shown in phantom, the door 3420 swings through 270 degrees to rest against the side 3360 of the trailer body in the same manner as a conventional door.

For the purposes of this embodiment, the recessed frame 3550 for each door can be defined as all or part of the “spacer frame” within the meaning of the term herein. That is, the folding panels can be nested within this frame structure.

It is contemplated that any of the structures described herein can be deployed automatically. For example, as shown in FIG. 36, a truck 3610 is moving at a predetermined speed (arrow 3620). Either automatically, when a sufficient level of speed is met (for example 35 mph), or by a deliberate operation of the driver 3710, the aerodynamic structure 3630 moves from a retracted position (FIG. 36) to an extended position (FIG. 37). Automated extension and retraction can also occur while the truck is stationary, without regard to the prevailing speed based upon the driver's direction or another predetermined condition. Likewise Automatic retraction can occur whenever the truck moves in reverse.

As shown in FIG. 38, a cargo door, 3810 of the exemplary truck trailer includes a spacer frame 3820 that supports a folded aerodynamic structure 3630 with panels 3830 in accordance one of the various embodiments of this invention (for example, the above-described “origami” type structure). Hence, the panels are each hinged to a respective portion of the spacer frame 3820. A linear actuator 3850 that is hydraulically or pneumatically controlled, and which responds to an electrical signal from a controller, is attached between the cargo door 3810 and (in this example) a portion of the central medial panel section 3860.

With reference briefly to FIG. 39, the actuator 3850 includes a base power unit 3920, a linear cylinder 3920 and a moving ram 3930. As shown in FIG. 40, when activated, the actuator 3850 extends the ram 3930, causing deployment of the folded medial panel section 3860. In this fully deployed orientation, the depicted pair of horizontal lower panel sections 4010 and 4012 are biased into a fully deployed orientation. Likewise, the outer panel 4020 is shown fully deployed at its characteristic taper.

Retraction/folding of the aerodynamic assembly 3630 occurs in a manner opposite deployment, with the ram 3930 begin drawn into the actuator 3850 to assume the retracted form shown in FIG. 38. In rear view, as shown in FIG. 41, the aerodynamic structure 3630 assumes the typical folded orientation. When extended, as shown in FIG. 42, the actuators 3850 are visible on the respective doors 3810. In alternate embodiments, the actuators can be secured beneath a covering for enhanced weather protection. Such a covering can be part of an aerodynamic surface that creates desired aerodynamic effects within the open cavity defined by the deployed aerodynamic panels.

As described briefly above, each actuator 3850 mounted on a respective door 3810 is interconnected via a control wire, or pneumatic/hydraulic line 4310 to an electronic, pneumatic or hydraulic controller (not shown) that can be instructed by a speed/motion sensor and/or the driver to selectively extend and retract the aerodynamic structure. This mounting arrangement allows easy access to the actuators and can enable the driver too quickly to deploy and retract the system manually if necessary. This arrangement also has the advantage that it applies force to the middle of the central medial panel section for even application of biasing force during deployment. However, this arrangement may be more susceptible to weather and wear and tear.

In an alternate embodiment, as shown in FIG. 44, the actuators 4410 can apply force to the central medial panel sections via an L-shaped extension 4420 that extends from each central medial panel section to a location beneath the aerodynamic assembly—in the region of the bumper. A pivot resides at each connection 4430 between the L-shaped extension and the actuator ram 4450. This allows the actuators to be located remote from the central region of each door, reducing the possibility of obstruction.

In a further alternate embodiment, shown in FIG. 45, the aerodynamic structure 4510 is biased by an outboard actuator 4520, with its ram 4530 attached to the outer panel 4540 of the aerodynamic structure. As shown in FIG. 46, during deployment, the outer panel 4540 opens to its maximum extension, thereby deploying the bottom sections 4610 and 4620, the top sections (not shown) and the medial panel 4630. This arrangement may be advantageous in that it provides less chance of interference between the trailer door locking rods and the mechanism. Such actuators also require less overall ram extension that can be placed closer to the hinge line 4660. This mechanism also provides increased locking strength to the overall structure in the retracted state, as it retains the outer panels, rather than the inner panels. Alternatively, the embodiment of FIGS. 38-43 is advantageous in that it locks the last panel to collapse in the open position rather than the first panel to collapse. In addition, closing the aerodynamic assembly is accomplished more efficiently by pulling on the medial panels. In further embodiments, both medial-mounted and outer pane-mounted actuators can be used, thereby overcoming all disadvantages. Hence, in a further embodiment, actuators position in accordance with a combination of the embodiments of FIGS. 38-46 can be combined.

While each of the foregoing embodiments shows the aerodynamic structures and their underlying spacer frame attached directly to a swinging truck door, it is contemplated that the aerodynamic structures can be attached directly to the door frame of the cargo body and swung separately from the doors. As shown in FIG. 47, a truck body 4700 has mounted thereon a pair of aerodynamic structure assemblies 4710 and 4712. Each assembly includes a plurality of deployable/foldable aerodynamic panels 4730 and 4732. The panels 4730, 4732 can be arranged according to any acceptable folding configuration. For example, they can be separate, locking panels or origami-type panels as described above. The panels are contained with in individual rectangular spacer frames the spacer frames are attached by hinges 4750 directly to the rear door frame 4760, rather than the cargo door(s).

As further detailed in FIG. 48, the spacer frame 4810 is depicted overlying the cargo body door frame 4760. The depicted spacer frame 4810 contains the hinged, nested aerodynamic panels of its respective aerodynamic structure. The spacer frame can be constructed similarly to any of the spacer frames described above so as to facilitate a stacked folding of panels without binding. As shown in FIG. 48, the cargo body employs a roll-top door 4820 in this example. Hence, this form of arrangement allows an aerodynamic structure to be attached to a cargo body with a non-hinged or rolling door. The two frames can be secured together in the closed orientation of FIG. 47 using any appropriate locking or fastening system including simple latches between the confronting central sides of the panels along the midline 4780. When unlatched, the spacer frames, with their aerodynamic structures can be swung outwardly as shown in FIG. 49. The spacer frames 4810, thus, are allowed to lie flushly against the sides 4920 and 4922 of the trailer cargo body. In this orientation, the rolling (or other type) door 4820 is revealed, and fully accessible. In order to facilitate the desired 270-degree swing needed to lay the drawers flat as shown in FIG. 49 against the sides, the hinges 4750 can be constructed in accordance with the teachings herein (e.g. similar to multi-pivot/multi-part hinge 1310 in FIG. 13). That is, the hinges can contain a central clevis and at least two parallel pivot points that allows the door strap pivot to be shifted to a location outside the respective plane defined by each of the body sides 4920 and 4922. The spacer frames 4810 can also include an appropriate actuation system according to the teachings herein so as to allow the panels to be deployed and folded/collapsed.

While a multi-part hinge, such as the hinge assembly 1310 described above, can effectively provide the needed clearance space to accommodate the swing of an increased-thickness door, it is recognized that the added thickness (up to approximately 6-8 inches) along with the increased weight of the doors may cause them to rotate out of a desired hinge line. In other words the doors may tend to twist along their many multi-pivot hinges. As such, the door assemblies may be difficult to relock to the trailer when closed, and may generally tend to droop.

Thus, it is contemplated that the hinge arrangement should be able to eliminate this unwanted degree of freedom and allow all cargo body hinges to be aligned along a common rotational path. In a number of examples, truck trailers use five hinges along each door. However, the use of a different number of hinges along a door is expressly contemplated herein. In a typical five-hinge assembly, it is contemplated that the uppermost and lowermost hinges can be of an anti-racking type of hinge 5000 as shown and described in FIGS. 50-55. These figures will be referred to variously in the following description.

The hinge assembly 5000 includes a gear cap assembly 5002 that resides over a door-frame-mounted hinge clevis 5004. The gear cap assembly is shown separately in FIG. 55. This hinge clevis 5004 can be an original clevis or a new clevis as appropriate. The gear cap assembly 5002 includes a mounting tab bracket 5006 that can be secured to the outer side of the trailer frame by a fastener (not shown) passing through the tab hole 5007 and into the cargo body frame. A gear face 5008 is provided along the perimeter of the gear cap assembly 5002. The gear cap assembly 5002 covers a two-pivot axis (axes 5013 and 5014) extension link 5010, shown separately in FIG. 54. The pivot extension link 5010 operates to extend the rotational radius of the hinge assembly similarly to the above-described central clevis 1330 (FIG. 13). One of the pivot axes 5013 extends through the door-frame-mounted clevis 5013, and resides within a tube 5012 of the extension link 5010. The extension link 5010 also includes a parallel second pivot axis 5014 within a remotely located tube 5016 on the opposing end of an intervening web 5018. The remote tube 5016 is interconnected with a geared spacer-frame-attached clevis 5020 (shown separately in FIG. 53). This geared clevis 5020 includes a bottom pivot base 5120 and a top, geared pivot base 5022. The geared pivot base 5022 includes a gear face 5024 that intermeshes with the cap's gear face 5008. The two pivot bases 5022 and 5120 are joined to a hinge strap 5030 that includes holes 5032 or other structures for receiving fasteners (not shown) therethrough. The fasteners are passed through the spacer frame in this embodiment. Note that the pivot pins (not shown) have been omitted for clarity from the bore of each pivot axis (5013 and 5014) in this illustration. In general, a through bolt or rod acts as the pivot for each axis 5013, 5014. Note that the components of the hinge can be formed form a sturdy metal, or where appropriate a durable polymer. In general, the load bearing components are typically constructed from steel due to its strength and durability.

Reference is now made to the top views of FIGS. 56-58, which show various stages of rotation of the door from fully closed (FIG. 58) to fully open (FIG. 58). In this embodiment, the geared cap 5002 remains rotationally fixed, along with its gear face 5008. Thus the geared clevis 5020 pivots about the pivot axis 5014 to swing the attached door and spacer frame (not shown in this figure). In FIG. 58, the line CLG between the axes 5013 and 5014 is directed perpendicularly relative to the plane FP of the door frame (not shown). The line CLG also represents the centerline of the extension link 5010. When the door is opened, the geared clevis 5020 (to which the door is attached) pivots, and its gear face 5024 meshes with the geared cap's face 5008. The intermeshing of the gear faces 5008 and 5024 causes the geared clevis to rotate (curved arrow 5700) as the line CLG swings around (arrow 5710), as shown in the half-opened view of FIG. 57). When swung fully opened (arrow 5810), as shown in FIG. 58, the geared clevis 5020 has rotated (arrow 5800) to orient the strap 5030 facing rearwardly, along the side of the cargo body (not shown). The gears 5008 and 5024 ensure that the door strap follows a precise swing pattern as the line CLG (and the underlying extension link 5010) are swung from closed to opened. Since every hinge assembly constructed in this manner swings according to the same pattern (e.g. swing on both axes 5013, 5014 is coordinated by the gears 5008, 5024), the provision of two or more properly aligned geared hinge assemblies in the overall array of door hinges ensures that the door will swing in a rotational set pattern on two axes that is governed by the gears, and is free of racking along a non-rotational degree of freedom.

Since the precise positioning of clevises and strap attachment points is not always accurate, the geared cap 5002 of each hinge assembly 5000 is adjustable so that the alignment of the pivots between two or more hinge assemblies in a door's hinge array can be varied. This simplifies installation of hinge assemblies. As shown in FIGS. 59-61, the geared cap 5002 consists of an upper adjustment-cam-following piece 5910 and a lower gear-carrying piece 5920. Both pieces 5910 and 5920 are mounted so as to rotate about the pivot axis 5013. This allows the rotational position of each gear face 5008 to be varied within predetermined limits. An eccentric cam 5930, rides within a closely fitting slot 5932 of the cam-following piece 5910. The cam 5930 is adjustably secured by a bolt 5934 that is seated in the underlying gear-carrying piece 5920. A pair of securing bolts 5940 area also seated in the gear-carrying piece 5920, and ride in arcuate slots on the cam-following piece. By loosening the bolts 5934 and 5940, the gear face 5008 can be rotated in response to rotation of the eccentric cam, within predetermined limits. Thus, the setoff RA1 in FIG. 59 can be increased by rotating (curved arrow 5950) the cam 5930 to a new setoff RA2 (FIG. 60). A greater setoff RA3 (FIG. 61) can be achieved by further rotation the cam 5930 (curved arrow 6020). When the proper setoff is achieved for each hinge assembly, the bolts 5934, 5940 are tightened to lock in this adjustment. In this manner, the door swings in the desired arc between the opened and closed position, and the gears in each hinge assembly 500 ensure synchronization of swing without racking.

For ease of operation, it is desirable that the aerodynamic structure/assembly be easily deployed using either automated or manual operations. In the case of manual deployment, it is desirable that the act of deployment occur without substantial effort and in a manner that is easily within the reach of an average-sized operation. Reference is now made to FIGS. 62-65, which depict a folding aerodynamic assembly 6200 mounted on the rear of a truck trailer 6210 according to another illustrative embodiment of this invention in which deployment of the reachable lower panels serves to simultaneously deploy the upper panels (and folding of the lower panels, likewise folds the upper panels). In this embodiment, each rear door (right door 6212 being shown) supports a respective set of three exterior panels including a side panel 6230 (shown already unfolded from the door), a upper panel 6232 and a lower panel 6234 (in which the top and lower panels are to be unfolded and deployed. The above-described solid medial panel is omitted, and instead, the aerodynamic assembly provides with a framework 6310 of swing arms and tie rods. When the top and lower panels are folded, this framework 6310 is nestled flush against the doors as shown. The horizontal swing arms 6326 of the framework 6310 are mounted on vertically aligned hinges 6328 to the door or door frame. They are tie together by at least one outer vertical connecting bar 6312. When the operator rotates the lower panel 6234, the hinged framework 6310 responds by rotating (arrow 6410) outwardly as shown in FIGS. 63 and 64, the upper and lower tie rods 6322, 6324, which respectively (and hingedly) are attached to the extreme ends of top and lower panels 6232, 6234 are biased by the motion of the lower panel, and resulting framework rotation. The bias of the upper tie rod 6322, thus, causes the upper panel 6232 to move in coordination with the lower panel 6234. In the fully deployed view of FIG. 65, the upper and lower panels are locked into the desired deployed orientation by the swing arms 6326 and tie rods 6322, 6324. The framework assembly can be further secured as described generally above by engaging latches at the bottom (location 6510) and top (location 6520) of the trailing edge junction between the side panel 6230 and respective upper and lower panels 6232, 6234. The framework 6310 provides an extremely strong, truss-based securing mechanism that resists significant inward pressure by the top and lower panels, while requiring very little force to deploy or refold. It also affords a single large cavity for the aerodynamic structure with only a lightweight open truss in the medial region. Note also that in this, and all other panel designs herein, it is contemplated that the edges of external panels can be fitted with appropriate seals or gaskets, both where they mate with each other and where they mate with portions of the door, frames and/or truck body. This ensures a clean aerodynamic structure without undesired stream air leakage into the cavity defined by the panels.

FIGS. 66-69 detail a further embodiment of the above-described origami-folding aerodynamic assembly 6600. In this illustrative embodiment, the entire rear of the truck body 6610 is depicted, with a discrete folding assembly 6620, 6622 mounted on each trailer rear door 6630, 6632, respectively. Each folding assembly 6620 and 6622 includes a respective side panel 6640 and 6642. As shown, the side panels 6640 and 6642 have been deployed, and this operation can be performed independently of deployment of the top and lower panels 6680, 6682 and 6660, 6662 (respectively).

Once the side panels 6640, 6642 are opened/deployed, the user then deploys the upper and lower panels 6680, m 6682, 6660, 6662 separately by pulling downwardly (arrows 6650) on the two lower panels 6660, 6662, which were previously folded against the doors 6630 and 6632. The lower panels 6660 and 6662 are attached at their inner/medial edges 6840 to lower portions of respective medial panels 6670 and 6672. The medial panels 6670 and 6672 consist of three sections. These sections, which are better shown in FIGS. 68 and 69, consist of a bottom section 6810 and 6812, a central section 6820 and 6822 and an upper section 6830 and 6832. The bottom sections 6810 and 6812 are hingedly joined to the inner/medial edges 6840 of respective lower panels 6660 and 6662. The bottom sections 6810, 6812 are also hingedly joined to the central section at hinge line 6860. Likewise, the top sections 6830 and 6832 are joined to respective upper panels 6680 and 6682 at hinge lines 6880. The central panels are hinged against the door at hinge line 6890. Thus, as depicted in FIGS. 66-69, as the lower panels 6660 and 6662 are pulled downwardly (arrow 6650) out of their folded position, they bias and unfold the bottom sections 6810, 6812 of the medial panels 6670 and 6672. This hinges out the attached central sections 6820 and 6822 which, in turn, each bias the attached upper sections 6830 and 6832. This bias of the medial panels forces thereby the upper panels 6680 and 6682 to hinge upwardly until the medial panels are brought into flush, confronting contact with each other as shown in FIG. 69. The top and lower panels are now fully deployed, and the overall aerodynamic shape is formed by the depicted pair of cavities 6920 and 6922. Note that the illustrative embodiment can employ the above-described sliding hinge assemblies to allow the panels to fold over one another and also deploy in a rectilinear manner as shown. Such sliding hinges can be located along the joints between the medial panels 6670 and 6672 and adjacent upper panels 6680, 6682 and lower panels 6660, 6662.

In this arrangement, a pair of gas springs or similar spring/damper units 6930 are hingedly attached between each lower panel 6660, 6662 and the respective bottom sections 6810 and 6812 of the medial panels 6670, 6672. These bars 6930 are hinged at both attachment points to fold freely against the adjacent folded panels when in a fully folded orientation against the respective doors 6630, 6632. These bars, thus, fold with the panels. The bars provide further directed bias to the medial panels 6670, 6672 when they are unfolded, and also serve to reinforce the fully deployed structure. As shown, the lower panels 6660 and 6662 are positioned at spacing above the bottom edge 6632 of the doors 6630 and 6632. In this manner, the conventional latches 6940 of the door can be accessed. In alternate embodiments, a different latch system can be employed allowing the panels to be brought to a lower portion of the door (described further below). The illustrative aerodynamic assembly 6600 also includes appropriate frame spacers and/or hinge extensions as necessary to allow clearance for the latches and/or to allow folding of the doors flush against the sides of the truck body 6610, in a manner described generally above.

In another embodiment, in which medial panels may be omitted, the bottom and upper panels can be deployed mechanically, using coupled hydraulic or pneumatic circuits attached to each set of top and bottom hinged panels on a respective door (or door frame). As shown in FIGS. 70 and 71, the illustrative lower panel 7010 is mounted on a hinge bracket 7012 against the door surface 7014. A hydraulic master cylinder and piston assembly 7016, connects to a linkage 7020 that is secured by opposing pivots 7022 and 7024 to the panel bracket 7026 and the piston shaft 7028, respectively. As the operator manually moves the panel between a folded and unfolded position (double curved arrow 7040), it causes the linked piston shaft 7028 to move in and out (double arrow 7030) of the master 7016 cylinder. This causes expansion or compression of the fluid contained within the cylinder 7016—i.e. unfolding the lower panel causes the piston to compress the fluid space, while folding causes the piston to expand the fluid space.

In this embodiment, the master cylinder 7016 feeds pressure via a pneumatic or hydraulic line 7018 to a slave cylinder 7116 shown in FIG. 71. This slave cylinder 7116 is joined to the upper panel 7120 by the piston shaft, via a pivot point 7124. An opposing pivot 7126 joins the base of the slave cylinder to the door or frame surface 7014. The upper panel 7120 is hinged with a hinge bracket 7112 that is mounted against the door surface 7014, near the upper end of the door/frame 7014. The line 7018 from the master cylinder 7016 is connected to the chamber of the slave cylinder 7116. When pressure from the master cylinder 7016 is varied, it causes the slave's piston shaft 7128 to move inwardly or outwardly (double arrow 7130) thereby causing the upper panel 7120 to move between a folded and an unfolded position (curved arrow 7140) in response to the relative movement of the lower panel 7010 by the operator.

In this embodiment, the operator manually pulls down on the lower panel 7010 to unfold it, thereby causing the shaft 7028 to generate pressure in the master cylinder 7016. This fluid pressure is routed along the line 7018 to the slave cylinder 7116. The routed fluid pressure causes a responding expansion within the slave cylinder 7116, which forces the slave's shaft 7128 to move outwardly, thereby unfolding the upper panel 7020. Thus, a movement of the lower panel by the operator causes the upper panel to respond in like kind. Conversely, when folding, the operator forces the master cylinder shaft 7028 outwardly, thereby creating space within the cylinder. This expanded space is filled by the pressurized fluid stored within the upper cylinder 7116. This causes the upper shaft 7128 to withdraw into the slave cylinder 7116, thereby folding the upper panel 7120. The illustrative hydraulic/pneumatic system is contemplated to operate manually in this embodiment. In alternate embodiments, a power and/or pressure source can be provided to one of the cylinders (by for example the vehicle's pressure system or a separate pump), thereby allowing both panels to open automatically at the press of a button. This system can also be used with a variety of side folding panels. In one example, a master is connected to one side panel, while a slave is connected to the other and a line routed along the bottom or top of the door frame connects the two cylinders. Since side folding panels are relatively easy to open, and readily accessible by the operator, folding and unfolding generally need not be automated. However, in alternate embodiments, manual or powered automation of the side panels can be provided.

FIG. 72 depicts another system for deploying the upper and lower panels in a coordinated manner with the user needing only to actuate the easily reached lower panel. As shown, a side panel 7210 has already been unfolded and deployed to provide clearance to deploy the opposing upper and lower panels 7220 and 7230. These panels 7220, 7230 are located on respective hinge bases 7222 and 7232 that extend the pivot points rearwardly from the door to, for example, provide clearance for locking rods. The upper and lower panels 7220, 7230 are joined by a cable assembly 7240. This cable assembly 7240 includes a sheath 7242 that is fixed at a top end 7244 and a bottom end 7246 so that it does not slide. Running through the sheath 7240 is a flexible braided steel (or other type) cable 7250. The cable 7250 is secured to a mounting point 7252 near the outer edge of the upper panel 7220 and opposing mounting point 7254 at the outer end of the lower panel 7230. When the lower panel 7230 is drawn downwardly, or pushed upwardly (double arrow 7260) the cable 7250 moves through the sheath 7240, causing a like reaction at the upper cable end 7252 (double arrow 7262). This causes the upper panel 7220 to deploy or fold in concurrently with the lower panel 7230. The weight of the upper panel 7220 should be sufficient to allow it to fold in as tension of the cable 7250 is released—based upon folding-up of the lower panel 7230. If further tension is needed to fully retract the upper panel 7220 to a fully folded orientation, then spring-loaded hinges and/or tension springs (not shown) can be provided between the panel 7220 and the door 7270 (or frame).

Another illustrative system for folding upper and lower panels is shown in FIG. 73. The upper panel 7320 is hinged to the door or frame member 7310 at an upper pivot point 7322. This pivot point is located at the rear end of the upper panel 7320, and is adjacent to the door or door frame. Conversely, the lower panel 7330 pivots at an outboard pivot point 7332 that is positioned a few inches (or more) remote from the plane of the door and frame 7310. Thus, a portion 7334 of the lower panel extends forwardly (in a vehicle reference frame) of the pivot point 7332. A linking rod 7340 extends between an upper, rearwardly placed pivot point 7342 on the upper panel 7320 and an end-mounted pivot point 7344 on the lower panel 7330. This eccentric pivot and link arrangement allows the linking rod 7340 to move upwardly as the lower panel 7330 is biased downwardly (curved arrow 7350) about its hinge pivot 7332. This upward movement (arrow 7352) of the linking rod 7340 is translated into upward pivoting rotation (curved arrow 7354) at the upper panel about its hinge pivot 7322. Thus, by locating the panel hinge points 7322, 7332 and the linkage pivot points 7342, 7344 at the appropriate positions, both panels can move between a fully folded and fully deployed orientation by moving only the lower panel 7330.

It should be clear that this invention contemplates a variety of other systems and methods for linking the two sets of panels (upper and lower) in an aerodynamic structure/assembly so that movement of one (usually lower) panel, moves both panels in the set. These techniques can employ a manual, automatic or combination of manual and automatic mechanisms to actuate folding and deployment.

Reference is now made to FIG. 74 which illustrates the provision of a modified “one-piece” hinge assembly 7400. In general and as discussed above, when a conventional trailer rear door is provided with additional rearward extension (e.g. length LE) due to the addition of the folding aerodynamic panels 7420, then that door can only be rotated to a full 270 degrees from the closed position (shown in phantom) to the fully opened position when that increased length LE is accommodated. In this embodiment, the conventional hinge butt 7430, which is permanently fixed (by bolts, rivets, welding, etc., to the body frame 7432, is extended by a novel extension hinge 7440. This extension hinge 7440, unlike the above-described two part hinge, does not rotate. Rather, it includes a side extension 7450 and a base 7452 that fit closely to the adjacent corner edges of the frame 7432. The extension 7440 is rotationally fixed in the desired orientation, with its pivot point 7460 extended rearward by a predetermined distance DE with respect to the original pivot point 7460. In this embodiment, the extension DE is directly rearward. Note that the side extension 7450 as well as other portions of the extension hinge 7440 are typically welded or otherwise fixed (rivets, screws, etc.) to the vehicle door frame side 7452 (and other frame locations) for added strength. A corresponding hinge-to-door bracket 7470 is attached to the door 7480. This extended bracket 7470 accommodates the increased length of the new hinge extension 7440. Given this extended length, the full door assembly can rotate through a full 270 degrees to the desired flush, confronting position along the vehicle side 7452 as shown. Note that in an alternate embodiment, the hinge 7440 can be mounted over an existing hinge butt 7430 by providing holes through each of the horizontal members of the hinge extension 7440, and placing a pin through the pivot point 7460 of the hinge butt 7430 and the holes. The hinge extension's attachment can be reinforced by appropriate welds if desired.

With further reference to FIG. 75, it is contemplated that the extended hinge structure 7500 (shown in phantom) can be shaped so that its pivot point 7510 is oriented anywhere within a predetermined arc 7520. Note that the hinge 7500 attaches to the existing butt hinge 7430 as a hinge extension in a manner described above with reference to FIG. 74. Alternatively, the hinge of this embodiment can be a purpose built one-piece hinge that attaches directly to the vehicle frame using welding, fasteners and the like. In this embodiment, the arc extends between a longitudinally, directly rearward position 7530 (position A) to an intermediate, 45-degree angled position 7540 (position C) to a 90-degree position 7550 (position B). At the 90 degree position B, the pivot point is directly in line with the rearward extension of the original pivot point 7460, but has been extended laterally outwardly by a distance WE—which is also the approximate radius of the arc from the pivot point 7460. This distance WE is sufficient so that a door assembly (with aerodynamic panels having an overall thickness LE—see FIG. 74) can be fully folded to the sides.

It should be noted that the construction of the hinge 7500 can take into account aerodynamic considerations. That is, the pivot point 7510 can be placed at a location that provides improved aerodynamic benefits and overall streamlining with respect to the vehicle side.

FIGS. 76-78 detail an alternate hinge system 7600 for use with the doors ad aerodynamic assemblies according to the various embodiments described herein. This hinge system 7600, which like the above-described geared hinges, allows for a substantial clearance of the door 7650 and folded aerodynamic assembly 7652 with respect to the trailer side (7810), while the closed door 7650 remains relatively flush with respect to the rear face 7620 of the trailer door frame 7630. The hinge assembly 7600 includes a base 7610, which is fixed to the vehicle frame 7612. The base 7610 includes two spaced-apart pivot axis points 7614 and 7616. Each point 7614, 7616 pivotally receives a respective connecting bar 7624, 7626. The opposing ends of the bars 7624, 7626 are connected to spaced-apart pivot axis points 7634, 7636 on a door-mounted hinge member 7640. The two bars can be on opposite vertically stacked sides of the hinge assembly 7600 so they do not interfere with each other during movement. Other non-interfering stacking arrangements can be employed in alternate embodiments. In the closed orientation (FIG. 76), the door 7650 resides relatively inline with the door frame face 7630. When opened (FIG. 77) the interaction of the bars 7624 and 7626 and their respective pivots 7614, 7634 and 7616, 7636 causes the door to move through a non-circular arc, away from the frame. As shown in FIG. 78, when the door is fully open and resides at approximately 270 degrees with respect to the closed orientation, the hinge assembly 7600 defines a clearance CH between the exterior face of the door 7650 and the trailer side 7810 that is sufficient to accommodate the folded assembly. The spacing of the hinge points 7614, 7616, 7634, 7636 and the length of the two bars 7624, 7626 determines the size of the clearance CH, and this can be derived using conventional mechanical engineering and geometric techniques.

Reference is now made to FIG. 79, which details another embodiment of a hinge system in which a thickened door (thickness LE) assembly is able to rotate through a full 270-degree arc. In this embodiment, the frame 7432 and the original hinge butt 7430 are unchanged. The associated pivot axis 7460 is used to facilitate the rotation between the closed position (show in phantom) and the open position. In this embodiment, conventional pivot point position (unchanged) is accommodated by providing a modified hinge door member 7910. The door member 7910 is attached to a normally located door 7920 that mounts the rearwardly directed aerodynamic assembly 7930 according to any embodiment described herein. The hinge 7910 allows the door to be inset by several inches (distance LE) forwardly along the frame 7432. Thus, when the door is opened, the combination of door 7920 and folded assembly 7930 will lay flushly against the side of the trailer body as shown. Note that the latching mechanism for the door may require modification—for example, providing latch bases that are forwardly inset within the top and bottom of the trailer to accommodate the inset of the door. It should be clear that a variety of door hinge shapes can be employed to allow the insetting of the door 7920 with respect to the frame 7432.

Another embodiment that can facilitate a full 270-degree rotation of the doors, while employing existing (or slightly modified) hinge assemblies and other components is shown in FIGS. 80 and 81. Each aerodynamic assembly includes a base, attached to a respective door 8010 which allows the upper and lower aerodynamic panels to fold away from the center region of the door, rather than toward it. Each door 8010 also supports a side panel 8020 along its surface. All panels are hinged closely to the door 8010 to produce a low profile. A piano-style hinge (for example hinges 8070, 8072) mounted between the door and each panel can facilitate such a low-profile, while still affording strength and a good seal against air leakage. Using either automated or manual mechanisms, the upper panels 8030 and the lower panels 8040 are each allowed hinge outwardly away from the respective door 8010 as shown. Appropriate locks or latches (which can be integrated into the operation of a lifting mechanism) should be provided, particularly to secure the upper panels 8030 in the upward orientation. In one embodiment, a panel thickness TO of approximately ⅝ inch is sufficient to allow the door to fold up flushly against the side. In this embodiment, the door latches may require relocation to, for example, a central area 8090 that is beyond the extension of the rear edges 8092 of the folded side panels 8020. In other embodiments, the panels may be sized to provide sufficient clearance room for the latches. This arrangement contemplates that the aerodynamic assembly is always deployed when the vehicle is in motion (at significant speed). Otherwise, the outwardly extending top and lower panels 8030, 8040 would act as a significant source of air resistance. However, when the vehicle is moving slowly (such as in a loading area) or is stationary, air resistance is not a concern and the panels can be extended upwardly and downwardly as shown.

FIGS. 82 and 83 detail another embodiment of a door and aerodynamic assembly that can allow flush, or nearly flush positioning of the opened doors with respect to the vehicle side—and also allows clearance of the door locking mechanism. In FIG. 82, the illustrative door and aerodynamic assembly 8200 is shown in a closed orientation with respect to the truck body 8210. In FIG. 83, the door and assembly 8200 is shown in a fully opened orientation. In this embodiment, an angled hinge member 8220 (defining a folded angle AH) is secured between the door 8230 and each of the top and lower panels (upper panel 8240 being depicted). This allows each upper panel 8240 to be angled slightly rearwardly toward the middle of the trailer in the folded orientation, so that these panels clear the locking rods and other locking components 8250 located at the center region of the door, while maintaining a low stackup at the lateral (external side) edge of the door. The side panel 8260 is free to swing out with respect to an extended door hinge 8270. The pivot axis 8280 of the hinge 8270 can be located at any acceptable position (e.g. within an arc as described above). Using sufficiently thin aerodynamic panels, a conventional hinge and axis location can be employed and allow the door assembly 8200 to swing through almost a full 270 degrees as shown in FIG. 83. In this manner, the door assembly resides relatively flushly against the side 8310 of the trailer body 8210. Other components of this novel door and aerodynamic assembly combination 8200 are described below.

Another technique for reducing the stackup of the trailer aerodynamic assembly is further detailed if FIGS. 84 and 85. In FIG. 84, the above-described assembly 8200 is mounted on the door 8230 with the side panel 8260 hinged so that its hinge pivot/axis of rotation 8400 is remote from the plane defined by its interior (cavity/door-facing) surface 8410. In this manner, when the side panel 8260 rotates into a deployed position (FIG. 84), the panel hinge member 8420 is angled as shown, which causes the outer end 8430 (shown in phantom beneath the butt hinge 8270) of the side panel 8260 to be located flush (or nearly flush) with side of the trailer body 8310. In this manner, the end 8430 of side panel 8260 can be positioned for maximum streamlining with respect to the side 8310 of the trailer body. Moreover, when closed (arrow 8510 in FIG. 85) the end 8430 of the side panel 8260 moves inwardly (arrow 8520 toward the center of the trailer allowing further clearance for viewing of vehicle lights or side hinges. Upper panels can be, likewise, mounted with hinge pivot points that are remote from the actual surface of the panel. Modified hinge brackets on the upper panels can be employed for this purpose.

FIGS. 86-89 detail an illustrative system and method for allowing the above-described door and aerodynamic assembly 8200 (shown with respect to one closed door 8230) to clear an exemplary locking rod 8620 provided on the outside of the door 8230. In this embodiment, the point of rotation of the top and lower panels has been moved based upon the above-described rearwardly/inwardly angled panel-to-door hinge member 8220 (of the hinge assembly 8650). The illustrative example shows only the upper panel 8240, but the lower panel of each assembly 8200 is similarly constructed (allowing the lower panel to hinge inwardly toward the center of the door 8230 along an angled hinge member). Based upon the orientation of the angled hinge member 8220, the medial side 8632 of the upper panel (and lower panel) is now positioned approximately two inches above the surface 8640 of the door 8230 when the panel is fully folded. This provides sufficient room for clearance of the exemplary locking rod (or rods) 8620.

As shown in FIG. 86, the aerodynamic upper panel 8240 is in a fully deployed position, with its hinge assembly 8650 oriented to be fully opened. Note that the aerodynamic side panel 8260 is also deployed. More particularly, the hinge assembly 8650 includes a door-mounted member 8652 and the above-described, angled panel-mounted member 8220. The hinge line 8656 between the two members 8220, 8652 has been angled so that during rotation (arrow 8710 in FIG. 87), the hinge 8650 causes the medial side to move outwardly (arrow 8720) away from the door surface 8640 further than the opposing exterior side (8680 in FIG. 86), which adjoins the aerodynamic side panel 8260. As the upper panel 8240 is further folded along the angled hinge line 8656 toward the door surface 8640 (see FIG. 88), the difference in door-to-panel spacing between the side panel side 8680 and the medial side 8632 becomes more pronounced. As shown FIG. 89, the panel 8630 is fully folded with appropriate clearance for the locking rod 8620. That is, the upper panel's medial side 8632 is at a clearance spacing CD from the door surface 8640 that is greater than the spacing between the panel's exterior side 8680 and door surface 8640. The medial spacing CD is sufficient to override the locking rod 8620, as shown.

It is further contemplated that the aerodynamic shape of the assembly can be adapted to retrofit to a variety of different types of trailers using some standardized components. In other words, certain “universal” components can be provided. One component is the above-described frame-mounted hinge member 8270 with pivot points (centered around through-cut holes 8280) formed on a pair of horizontal, spaced-apart hinge butts joined by a vertical web or “side covering.” The hinge member 8270 is formed by stamping a unitary piece of sheet metal having a predetermined thickness TH. The thickness TH can be between approximately ⅛ inch and ½ inch in various embodiments. The dimension TH can be even thicker in more heavy-duty applications. The hinge member 8270 is typically constructed from a strong material such as steel of an appropriate grade and type, or another metal with high strength and durability.

With further reference to the partial view of a truck body in FIG. 91, the hinge member 8270 generally defines a streamlined shape with respect to the side 8310 of the trailer body. As shown, each hinge member 8270 mounted vertically along the rear frame of the trailer body presents a smooth profile between the aerodynamic side panel 8260 and the respective hinges 8270. A series of cutouts 9110 minimize gaps between the hinges 8270 and the adjacent aerodynamic side panel surface 8360 (shown fully deployed). Moreover, the outboard side covering 9010 of the hinge 8270 provides increased structural strength to prevent yielding and deflection based upon the additional mass of the door with the aerodynamic assembly attached thereto, as well as the more rearward location of the pivot 8280. In general, airflow across the hinge passes over the outboard hinge plate 9010 rather than forming all turbulent vortices at each hinge gap. Note that the distance DH between the horizontal hinge butts 9020 of the hinge member 8270 are sized somewhat larger than conventional truck body hinge butts. This allows the tail member 9030 on the outboard side 9010 of the hinge 8270 to be welded anywhere vertically along the side of the trailer's rear door frame. This hinge configuration can, thus, be located to fit over an existing hinge butt, while providing proper door and aerodynamic assembly function without the need to grind off the existing hinge butt.

Reference is now made to FIG. 92 in which the challenge of applying the assembly to doors (exemplary door 9210) having different sized door-to-frame gaskets 9212 is addressed. As shown the aerodynamic side panel 9220 according to various embodiments is mounted to a hinge assembly 9222 as described herein with hinge pivot 9224. The door base 9226 of the hinge assembly 9222 would normally interfere with the rearwardly projecting, thickened door gasket 9212 if mounted flushly upon the rear surface 9230 of the door 9210. However, employing a thin, corrosive-resistant plastic or hard rubber strip 9240 (secured to the hinge base 9226 and door 9210 with a through bolt assembly 9250) creates a gap GH between the hinge member 9226 and the trailer door surface 9230. Existing trailer door gaskets of different lengths and thicknesses can fit in this gap, and the spacer 9240 can extend outboard of the trailer door 9210 without interference to accommodate a desired gap size (GH). The aerodynamic side panel 9220, or an aerodynamic upper or lower panel, rotating about a point (9224) away from a door surface attached in this manner can fold out to the outboard edge of a trailer (shown as a dashed line 9260). The mounting location of the spacer 9240 and fastener(s) 9250 on the trailer door 9210 can be adjusted to ensure proper fit for trailers having a variety of specifications and dimensions. In general, by placing the rotation axes of panels some distance remote from their inner surfaces (surface 9270, for example), allows attachment to trailer doors with different gasket sizes, door frame thicknesses, etc.

Another challenge in providing universal fitment is that the gap between right and left (port and starboard) upper and lower panels may vary based upon the width and spacing of the rear doors. During operation the doors may also flex somewhat, thereby varying the gap therebetween. Referring to FIG. 93, a cross section of the medial region between a left horizontal aerodynamic panel (upper or lower) 9310 and a right horizontal panel (upper or lower) 9320. A gap 9330 of several inches is purposely provided between the panels 9310, 9320. This gap 9330 is covered for sealing purposes with one or two medial wipers 9312, 9322 attached to either or both the left and right panels 9310, 9320 at their medial edges 9314, 9324, respectively. In this embodiment, medial wipers 9312, 9322 are constructed oversized, soft and flexible foam or rubber gaskets that bend or deflect to seal gaps (9330) of different widths along the length of the panels 9310, 9320. In this embodiment, both wipers 9312, 9322 have the same dimension, facing opposite directions. They include a respective base portion 9340, 9342 that overlies the medial end 9314, 9324 of each panel and an inwardly extended gasket section 9350, 9352. The gasket sections overlap each other and at least one becomes elastically deflected slightly (arrow 9360) in engagement with the other to create the desired seal therebetween. The cross sectional shape and dimension of each gasket section is highly variable and can be chosen to improve the mating between gaskets as well as the sealing properties (using for example further lips, ridges, etc.). For trailers with especially large or small gaps between the port and starboard top and bottom panels, medial wipers having gasket sections 9350, 9352 of different overall gap-spanning width dimensions WM can be interchanged to ensure proper sealing and fit with no modification of the panels or custom parts.

As discussed above, other systems and methods can be employed to allow the aerodynamic panel assembly to clear the door locking mechanism on a variety of trailer types and styles. In particular, the locking handles should be accessible, at least when the aerodynamic assembly is retracted. One technique described above, entails locating the lower panel above the locking handles. Alternatively, the trailer door locking mechanism itself can be modified, thereby allowing the lower panel to extend as low as possible with respect to the doors. A variety of alternate locking mechanisms are also contemplated. FIGS. 94 and 95 detail a typical pair of hinged trailer doors 9410 mounted on hinges 9420 within a door frame 9430. The aerodynamic panels are omitted for clarity. In this embodiment, vertically moving, retractable lock rods 9450, 9460 (shown in phantom) are slidably mounted along the interior surface of each door or within channels formed on the body of a thickened door. In either case, the rods do not project from the outer surfaces of the door, where they would impede mounting of a lower-profile aerodynamic assembly. Such rods move vertically from a disengaged position shown in FIG. 94 in opposing directions (arrows 9520, 9530 in FIG. 95) to engage respective orifices 9470, 9480 in the bottom and top of the rear frame 9430 of the trailer, as shown in FIG. 95. A rod-actuation mechanism can be positioned on a convenient location that is accessible on the outside of the door, or at another location. The rods 9450, 9460 can be manually operated or automated. In this embodiment, rotating handles 9490 are mounted on the door exterior at a position remote from interference with the folded panels. The handles 9490 can be retractable so as to provide a low profile when not in use, or can be located beneath the lower panel's hinge position. As shown, the handles rotate (curved arrows 9550 in FIG. 95) from an unlocked/disengaged position (FIG. 94) to the locked/engaged position (FIG. 95).

Another alternate door locking assembly that reduces the overall exterior profile of the doors employs rotating lock rods that are mounted on the inside of the door, but otherwise operate similarly to conventional exterior-mounted rotating lock rods. A locking handle can be provided with respect to each of the rods through a recessed port in the door for easy access. This arrangement also eliminates the need for fitting the bases for the aerodynamic panels around lock rods. Further alternate embodiments can use internally mounted electromechanical actuators (solenoids, for example) that lock and unlock with respect to the top and bottom of the door frame.

A streamlined shape that places the mating edges (forward edges) of aerodynamic panels as close to the outer edge of the trailer body is highly desirable. However, the end of the vehicle may contain lights along the rear that are slightly inboard of the outer edge-particularly along the top rear face of the trailer. Often, such lighting is a requirement under state and federal vehicle laws and regulations.

FIG. 96 shows a system and method for providing required lighting to a streamlined aerodynamic assembly 9600. In this embodiment, the upper panels 9610 mate closely with respect to the corner of the top frame 9620 of the trailer body. The mating edge 9630 of each panel can be directly hinged to the frame, or provided with a remote hinge pivot point on a respective door hinge member as described above (see FIGS. 85 and 85, for example) that allows the forward mating edge to extend outwardly to meet the adjacent frame edge. In either case, the normal position of the lights on the top rear face of the frame 9620 has been obscured. Accordingly, a set of lights 9630, 9632 and 9634 has been affixed to the outer surface of each upper panel 9610 at the appropriate spacing and mounting positions to comply with regulations. The lights can be custom-shaped or a commercially available type that allow for surface mounting. The new lights 9630, 9632, 9634 are connected to the existing lights on the frame or another connection via appropriate wires (or fiber optics), that pass through the panels and into the vehicle as shown by dashed lines 9650 allowing for a clean exterior surface, free of exposed wires. The shape of the lights, combined with the downward angle of the deployed upper panels 9610 renders a relatively low profile light visible from behind. When folded, the lights are still visible so long as they are not completely covered by the side panels in a folded orientation.

In another embodiment, shown in FIG. 97, the aerodynamic assembly is mounted to a header 9710 that defines an inward taper on all sides matching the taper angle of the adjacent aerodynamic panels 9712, 9714. The header is part of an integral door frame system, which is attached to the rear of the trailer body 9720. It is constructed typically as part of an OEM trailer to achieve optimal aerodynamic efficiency. In this manner the header 9710 presents a continuous streamlined transition from the trailer body to the rear ends of the panels. The panels can be hinged to the doors (9740) or header 9710 as described variously above. The header includes a plurality of top-mounted lights 9750, 9752, 9754 mounted across the top at the required locations. The lights 9750, 9752, 9754 are embedded within the header so that only a flush (color tinted) lens is visible, while the electrical and lighting elements (LEDs for example) are recessed within the header 9710. This arrangement provides complete streamlining of the lights. They are electrically (or optically) connected to the existing light connections on the vehicle frame 9720, or otherwise connected to the lighting control of the vehicle. Again, the slant of the aerodynamic assembly 9700 and header 9710 ensure that the lights are visible from behind. They are also visible when the aerodynamic panels are folded.

Another system and method for providing required top (or other location) lighting to a vehicle rear equipped with an aerodynamic assembly is shown in FIG. 98. In this embodiment, the existing vehicle lighting 9810, 9812 remains in place on the rear face of the vehicle frame 9820, or is only slightly modified. At the forward edge 9832 of the aerodynamic upper panels 9830, a section adjacent to each set of lights has been cut out, and replaced with a transparent or translucent material panel sections 9840, 9842 of approximately the same thickness as the surrounding panel sheet. The width WTP1, WTP2 of respective panel sections 9840, 9842 is sufficient to expose the underlying lights 9810, 9812. The width should afford an appropriate angle of viewing from behind. Likewise, the rearward length LTP1, LTP2 of respective sections 9840, 9842 should be sufficient to expose the light for viewing from the rear given the taper angle of the panels 9830 when deployed and when the panels are folded. A variety of alternate techniques for providing lighting to the panels, such as embedded fiber optic emitters, etc. is expressly contemplated. Likewise additional lights can be provided, for example, at the rearward edges of the panels. Again fiber optic systems or other types of lighting (LED bars, for example) can be employed to accomplish this and other lighting tasks with respect to the aerodynamic assemblies according to this invention.

Again note that any of the above-described systems and methods for providing light using an aerodynamic assembly can be applied to brake and tail lights as well as backup lights mounted at acceptable locations with respect to the rear of the trailer.

FIG. 99 shows an illustrative embodiment of an aerodynamic assembly 9900 that deploys an upper panel 9910 and a lower panel 9920 using a linkage therebetween that comprises a swing arm assembly 9930, according to the principles discussed generally with reference to FIGS. 62-65 above. Note, as used herein, with respect to the coordinated movement of the upper and lower panels (or generalized folding and deployment of an aerodynamic assembly) the term “linkage” shall mean a mechanical, fluid or electromechanical assembly that allows at least a second aerodynamic panel to move between a folded and deployed position in coordination with the movement of a first aerodynamic panel between a corresponding folded and deployed position. In this embodiment, the upper and lower panels 9910, 9920 of the assembly 9900 have been attached using hinges applied directly to the surface of the trailer door 9940 using the depicted fasteners (bolts, rivets, etc, or an alternate attachment mechanism (i.e. adhesives, welding and the like). The sing arm assembly 9930 of this embodiment includes a central frame 9950 having a pair of horizontal hinge bars 9952 that extend from door mounted hinges 9954. The hinge bars 9950 are tied together by a pair of vertical tie bars 9956 and 9958 that provide a stable framework for the overall swing arm frame 9950. The outer vertical tie bar 9958 of the swing arm 9930 includes, at opposing ends, a ball joint swivel connection 9960 (described further below) for a respective upper and lower tie rod 9962 and 9964. The opposing ends of each tie rod 9962, 9964 are attached to an attachment location 9964 and 9966 (shown in phantom) on the respective upper and lower panels 9910 and 9920. Described further below, the panel-folding hinges 9970 and 9972 of the upper panel 9910 and the panel-folding hinges 9974 and 9976 of the lower panel are mounted to define particular angles that allow the folded upper and lower panels 9910 and 9920 to clear a lock rod 9980 of the trailer door 9940 when in a fully folded position. It can be assumed that the opposing trailer door (left side as depicted) contains a similar panel and linkage structure to that of the right side, and which has been removed/omitted for clarity. This description shall apply equally to the opposing door and aerodynamic structure, which, together with the depicted and described structure constitutes a complete folding/deployable aerodynamic assembly.

As will be described further below, the side or lateral panel 9990 is mounted on hinge assemblies 9992 that (in a retrofit application) overly the preexisting trailer body hinges. The hinge assemblies 9992 are designed to relocate the hinge points/axes of the trailer door 9940 directly rearwardly, and also encapsulate separate hinges, which pivot on discrete axes (remote from the door hinge axis to allow folding of the lateral panel 9990. As will also be described, the hinge assemblies 9992 are constructed as part of an overall hinge butt plate 9994 that is attached to the rear outer corner of the trailer frame by welding, fasteners and/or any other acceptable attachment technique. An opposing hinge butt plate 9996 is shown attached to the opposing side of the vehicle frame with door and aerodynamic assembly removed for clarity. The door hinge portions of the overall hinge assemblies (9992) (e.g. the hinge portion attached to the trailer door) have been omitted from this side-typically by detaching through-bolts and nuts that act as hinge pivots—revealing the hinge clevises 9998 that define the pivot axis and capture the door hinge portions of the assembly.

The panels 9910, 9920 and 9990 can be constructed from a variety of materials. Where possible thickness is minimized to allow for a lower-profile stack-up in the folded position. However, the panels should remain sufficiently rigid so as to avoid excess vibration and deflection at high speed, and should maintain their shape even with minimal locking points between panels and an open, floating confrontation (without locks) at the medial junction between upper and lower panels. Examples of accepted upper lower, lateral (etc.) panel materials and constructions can include, but are not limited, to: honeycomb sandwich panels of any combination of honeycomb and skin materials, ply-metal (wood sandwiched between metal skins) panels, foam sandwich panels with any combination of foam and skin materials, fiber-reinforced plastic panels, fiberglass panels, sheet-metal panels with stiffening ribs, composite sheets with stiffening ribs, or cloth or other non-rigid material stretched over a rigid frame.

Notably, as shown in FIG. 99, the upper panel 9910 and lower panel 9920 are each secured in the depicted deployed position with respect to the lateral panel 9990 by single, discrete locking assemblies 9997 and 9999 respectively located at the mating outer corners of the confronting panel junctions. These locking assemblies allow for the quick attachment and release of upper and lower panels with respect to the lateral panel.

FIG. 100 shows the lower panel 9920 and lateral panel 9990 in a deployed and locked-together position in further detail. The locking is accomplished by a lock base 10010 mounted on the lateral panel 9990. The lock base includes a V-shaped entry groove (V-groove) 10012 and a pivoting latch or catch 10014 that are similar in construction and operation to a garden gate lock of conventional design. A pivot 10016 allows the latch to move pivotally (curved arrow 10018) with respect to the lock base 10010. In the depicted orientation, the latch 10014 has captured the locking pin 10020 mounted on the inside face of the lower panel 9920 within a well 10050 located below the V-groove 10012 on the base. The lower panel 9920 is restrained from movement in this orientation. Likewise, the lateral panel 9990 cannot move inwardly due to the obstruction of the lower panel 9920. A small lever extension 10030 is provided on the opposing end of the latch 10014. It includes a hole that allows attachment of a release cable (not shown)

When a cable or other actuating mechanism (attached to the latch lever 10030) applies upward force on the lever 10030 (arrow 10032), the latch 10014 pivots (curved arrow 10018) as shown in FIG. 101. As detailed, the lower panel 9920 is now free to move upwardly (arrow 10110) with the pin 10020 no longer captured within the V-groove 10012. This upward movement allows the lower panel 9922 to be moved pivotally about its hinges into the folded position as shown by the continuing upward movement (arrow 10210) in the illustration of FIG. 102. As shown, once the panel's locking pin 10020 has cleared the latch, 10014 in FIG. 102, the latch 10014 can return to a closed position. For example, the latch can include a spring (not shown) that allows it to remain in the closed orientation of FIGS. 100 and 102 when not biased by movement of the lever 10030 into an unlocked position. When the panels are redeployed, and the pin moves back into engagement with the latch, the locking pin 10020 forces its way along the curved top surface 10220 of the latch 10014, thereby moving the latch temporarily out of an obstructing orientation. This movement allows the pin to pass through the V-groove 10012, and into the capturing well 10050. When no longer obstructed, the latch 10014 springs back over the pin 10020 to relock the assembly (as shown in FIG. 100). It should be noted that the upper panel locking assembly 9997 is similarly constructed, and operates in similar manner, facing in an opposing direction (e.g. facing downwardly). The latch levers of the two assemblies 9997 and 9999 can be tied together by a cable or other linkage (not shown) so that actuation of each lever occurs simultaneously by pulling upon a single cable with a single motion of the operator. In this manner, by folding the lower panel 9920, the upper panel 9910 is unlocked and folded at the same time. Appropriate guides and/or pulleys (not shown) can be provided to enable a release cable to serve each latch, with a handle at a convenient location for the operator. Such an arrangement should be within the scope of ordinary skill.

The folding action of the upper and lower panels 9910, 9920 is shown further in FIG. 103, in which the locking pins 10020 and 10320 of the associated locking assemblies 9997 and 9999 are fully released. In this manner, the upper panel 9910 and lower panel 9920 are in the process of being folded fully against the surface of the door 9940 by action of the interconnecting swing arm assembly that coordinates the folding/unfolding movement of these two panels. In this embodiment, the operator applies folding action to the lower panels. As described above, the folding/unfolding action can be applied by an automated mechanism, based upon a number of different triggering devices, including a cab or trailer-mounted switch or automatic, speed-or-motion-sensing circuits.

As discussed generally above, reference to the present embodiment, and also in connection with the embodiment of FIGS. 82-89, the upper and lower panels 9910, 9920 are adapted to fold so that they generate a gap near the medial center of the trailer body to allow clearance for the door lock rod (9980 in FIG. 99). As shown in further detail in FIGS. 104 and 105, the depicted upper panel 9910 is mounted on a pair of panel-folding hinges 9970 and 9972. The hinge 9970 defines a hinge pivot point 10510 that is closer to the horizontal corner 10520 defined between the door 9940 and the deployed upper panel 9910. Conversely, the more central hinge 9972 defines a hinge pivot 10530 that is more remote from the corner 105320. With reference particularly to FIG. 104, the two hinge pivot points 10510 and 10530 thereby define a hinge line (10450) that is disposed at an angle AHL with respect to the horizontal line defined by the corner 10520. The angle AHL is between approximately one degree and five degrees and is approximately two degrees in the illustrative embodiment. In addition, the panel side/strap of each hinge (e.g. panel hinge component 10540 for hinge 9970 and 10550 for hinge 9972 define a different shape and length. In a general, the inner hinge component 10550 has a longer connecting strap 10552 than the connecting strap 10556 of the outer hinge component 10540. This increased strap length allows the inner portion of the upper panel 9910 to extend outwardly further from the door surface. As shown generally in FIG. 106, the folded panel effectively clears the lock rod 9980. Note that the lower panel hinges 9974 and 9976 (shown in phantom) define the same geometry as the upper hinges 9970 and 9972 thereby allowing the lower panel 9920 to fold in a similar manner—but in an upward, rather than a downward folding direction.

As shown further in FIGS. 104-106, the illustrative embodiment provides a novel door hinge assembly, consisting of a number of discrete hinge assembly units 9992. Each hinge assembly 9992 is adapted to overly the existing trailer frame door hinge clevises (in a retrofit application), as will be described further with reference to FIG. 114 below. Each hinge unit 9992 is mounted on an elongated, vertically mounted hinge butt plate 9994 as described above. The hinge butt plate 9994 affords a desirable aerodynamic transition between the trailer body door frame 10570 and the lateral panel 9990. That is, the hinge butt plate 9994 is attached to the vehicle frame with a relatively flush mating between the two surfaces, thereby providing a more streamlined side profile surface with less of a jump discontinuity therebetween.

With further reference to FIGS. 107-109, each hinge unit includes a door hinge portion 10590 that is seated within the clevis 9998. The clevis is defined by two opposing clevis plates 10572 that are welded or otherwise joined to the hinge butt plate 9994 in a manner described below. The door portion 10590 of the hinge unit 9992 consists of a door strap mounting member 10592 that is mounted to the door panel 9940 using bolts or other fasteners in a manner of a conventional door strap hinge. The hinge assembly defines a hinge pivot point 10620 that extends a predetermined distance of offset DOH rearwardly from the door frame or original door hinge pivot axis. In illustrative embodiment this offset measures approximately 3-5 inches. The offset can be varied based upon the overall thickness of the door stack when the panels are fully folded. In order to accommodate the rearward offset (DOH), the door portion 10590 includes a multi-angled extension strap portion 10720. This portion 10720 is designed to overlie the door frame 10570 and other assembly components. The strap extension portion 10720 extends to a pivot tube 10730. This tube 10730 has a cylindrical inner surface, which allows the insertion of a pivot bolt that passes through both the clevis plate holes 10580 and the tube 10730 to thereby define the assembled pivoting hinge unit 9992. The particular geometric arrangement of the strap extension 10720 and the distance it spans between the door mounting plate/strap 10592 and tube 10730 are highly variable—and the hinge strap extension 10720 can be formed to accommodate the particular door-to-frame geometry.

As shown, a pair of inner hinge plates 10750 are welded or otherwise attached to a square slot 10760 provided in the middle of the strap extension 10720. The assembled construction is likewise shown in FIG. 108. This construction defines a second pair of pivot holes 10770 formed in each of the inner hinge plates 10750. These holes 10770 are remote from the pivot tube 10730. The holes accommodate a discrete, independently pivoting central hinge member 10598 having a pivot bolt that rotatably secures the inner hinge member 10598 with respect to the overall door hinge portion 10590. The completed door hinge assembly is shown in FIG. 109. As shown, the inner hinge member 10598 includes a securing strap 10920 that attaches to an appropriate location on the lateral panel 9990. The geometry of the inner hinge member 10598 and location of its securing strap 10920 are chosen so that the hinge panel folds flushly against the two folded upper and lower panels 9910 and 9920 in the folded position, but allows the lateral panel to deploy into a closely conforming orientation with respect to the hinge butt plate as defined the junction line 10599 (FIG. 105). Each assembled hinge unit 9992 allows for 270 degree folding of the door (defining a rearwardly placed hinge pivot) as well as an aerodynamically smooth transition between the hinge butt plate and the attached lateral panel 9990.

The rotation of the hinge units 9992 from the closed position to the fully opened position (270 degrees) is depicted in further detail of the sequence of views in FIGS. 110-112. As shown, the adjacent folded panels (upper panel 9910 and lateral panel 9990) are secured flushly against the door surface 9940. Given the rearward extension (DOH) of the hinge pivot hole 10580 (distance DOH) allows the opening of the door 9940 to accommodate the added thickness created by the folded aerodynamic stack-up, in a manner described generally above. In contrast to above-described embodiments herein, the depicted door swing is accommodated by a single hinge pivot in this embodiment. The hinge door portion 10590 can be clearly seen angled outwardly with respect to the hole 10580. Likewise, the central portion 11020 of the strap is relatively parallel to the side wall of the vehicle. The edge of the upper panel 9910 is, thus, not obstructed by this portion as it is folded in. As shown in FIG. 110, the fully folded assembly is ready to be hinged outwardly (curved arrow 11030). In FIG. 111, the door 9940 has been hinged (curved arrow 11030) to a position approximately 200 to 220 degrees from its original location. The panel pivot hole 10720, which is part of the door portion of the hinge unit 9992, can be clearly seen. The geometry of the hinge portion 10590 allows for significant clearance of the stacked panels 9910 and 9990. In FIG. 112, the stacked panel arrangement and door 9940 have been moved to a position that is approximately 270 degrees from the original closed orientation. The door portion of the hinge unit 9992 has effectively provided clearance for the entire folded panel stack.

As described generally above, the illustrative embodiment can be adapted for somewhat universal attachment to variety of trailer frame configurations. Many trailer frame types vary significantly in the relative placement of door hinges and number of door hinges mounted. The novel hinge butt plate 9994 of this embodiment is shown in further detail in FIG. 113. This hinge butt plate 9994 includes an elongated base 11320 that is adapted to be secured to the side of the trailer frame by fasteners, welding and/or any other accepted technique. A folded-over rear edge 11330 provides further stiffness to the hinge butt plate 9994. In an illustrative embodiment, the hinge butt plate 9994 is constructed from steel having a thickness of between approximately one-sixteenth and three-eighths inch. The material used to form the butt plate, and corresponding sheet thickness thereof, are highly variable. The butt plate 9994 can be manufactured as a singe unit without any cuts along the base 11320 and its folded-over end 11330. In this embodiment, slots or cuts 11340 have been located at specific positions that correspond to a particular type of trailer frame. Slots 11340 can be made using any acceptable cutting mechanism including a milling machine, laser/plasma/water cutter, or an accurate saw. Within each cut are provided the upper and lower clevis plates 10572 that define the overall clevis that encapsulated the door hinge portion 10590. The clevis plates 10572 are secured to opposing ends of the cut 11340, and welded in place. A bottom gusset plate 11350 is also provided at the bottom edge of the butt plate 9994 in order to further stiffen the assembly against possible crush upon contact with loading dock or other obstruction. It should be clear that the retrofitter can order plates having clevis locations that match the placement of preexisting door hinge clevises. The manufacturer simply cuts slots at the specified location to match the requested retrofit specification and welds in the appropriate clevis plates. A customized, but universally applicable butt plate is then shipped to the retrofitter.

Referring further to FIG. 114, the assembled hinge butt plate 9994 with welded-on clevis plates 10572 in the correct locations is shown attached to the vertical corner of the vehicle frame 10570. As shown, the clevis plates are disposed at a vertical spacing WCP of approximately three to eight inches so as to provide ample clearance for the preexisting trailer hinge butt 11420. Thus, when properly constructing the hinge butt plate 9994, the user need not remove the original hinge butts 11420, but rather may simply overlay the new clevises on them, thereby reducing the effort required to retrofit the vehicle. In addition, the door portion of the hinge unit 9992 can be constructed to mate with original door bolt holes 11430 as shown in phantom. In alternate embodiments, the user simply drills new holes in the door to accommodate the attachment of the door hinge portion of each hinge unit. Note that in a new equipment (OEM) implementation the hinge butt plate of the type shown (or a similar type) may be formed as part of the original door frame. Alternate types of door hinge clevis arrangements can be used in OEM applications. According to this embodiment, such OEM applications typically locate the clevis door hinge pivot holes at the desired offset DOH from the door frame to achieve the desired spacing when the door swings open to the full 270 degrees.

To further facilitate the retrofit of a somewhat standardized aerodynamic assembly to a variety of trailer configurations, and also to allow for ongoing adjustment of the installed aerodynamic assembly, additional features are provided in accordance with this embodiment. With reference to FIG. 115, the trailer's original lock rod 9980 may be located at various positions along the door 9940—each position being unique to a particular trailer model. As such, the upper panel 9910 and lower panel 9920 (not shown in this view) should be able to provide clearance for the lock rod 9980 without requiring a large universal slot that would reduce the aerodynamic performance of the assembly. Hence, the rear edge and side inner/medial edge of each upper and lower panel is provided with an L-shaped medial sealing strip 11520. The medial sealing strip has a width WMS of approximately two inches and a rear depth DMS of approximately two inches. The underlying panel's width and localized depth is reduced to accommodate the extension of the sealing strip. The sealing strip is mounted using fasteners 11530 as shown, or another attachment mechanism, so as to slightly overly the main panel structure, thereby providing a secure fitment. In this embodiment, the medial sealing strip 11520 is constructed from an appropriate aluminum alloy having a thickness of approximately one-eighth inch. In alternate embodiments, the sealing strip 11520 can be constructed from other acceptable materials, such as a composite, and its thickness is highly variable. The relatively thin aluminum of the sealing strip allows for ready cutting of a clearance slot or hole 11540 that allows for a closely-conforming clearance channel through which the lock rod 9980 extends. Because the hinge points of the upper and lower panels 9910, 9920 are offset (as described above), when the panels hinge inwardly to fold, the rear edge of the panel moves away from the door. Thus, the hole 11540 does not bind against the lock rod during hinging lock rod. As shown in FIG. 93, the inner edge 11560 of each medial sealing strip 11520 can include one-half of the overlying medial wiper assembly. This allows for slight movement between panels, and accommodates a certain degree of inherent width-variation when the assembly is mounted of a given trailer frame. Where a particular trailer model has a significantly wider or narrower width, a corresponding wider or narrower medial sealing strip can be attached to the upper and lower panels to accommodate this difference, while maintaining a standard panel size.

Note that, in addition to the medial wiper, selected edges of upper, lower and lateral panels of the illustrative embodiment (and/or any other embodiment described herein) can be provided with appropriate weather strips where they confront each other, the vehicle frame and/or the hinge butt plate. This assists in maintaining a relatively wind-tight seal for the overall aerodynamic assembly 9900 and its interface with the rear of the trailer body/door frame.

As also shown in FIG. 115, the upper frame member 11570 of the trailer door frame includes top marker lights 11572. Highway regulations typically require that such marker lights remain visible from a range of viewing perspectives. As described above, with reference for example to FIGS. 96, 97 and 98, various OEM-type implementations of marker lights are contemplated that allow the top panels to be substantially flush with respect to the top frame member and vehicle body roof. However, in a retrofit application, it may be more cost-effective and compliant with regulations to employ the original marker lights 11572 in an unobstructed manner. While this may result in some diminishment of the aerodynamic streamlining that is afforded by the assembly 9900, it is a minimal reduction in efficiency. Thus, each upper panel 9910 and its associated folding hinges are mounted so that the rear edge of the upper panel engages the top frame member beneath the marker lights. In alternate embodiments, the retrofit assembly (or other implementation) of the overall aerodynamic assembly 9900 can include marker lights that allow for flush mounting with respect to the top of the frame member 11570. Such an implementation can employ clear windows that expose underlying marker lights, surface-mounted lights, and the like.

Adjustment of the assembly during installation, and during the service life of the assembly, is further accommodated through the use of tie rods 9962 (and 9964) that are adjustable for length. FIG. 116 shows an exemplary tie rod 9962 in further detail. The tie rod 9962 consists of a central shaft or rod 11610 constructed from an aluminum bar stock, and having an illustrative diameter of approximately three-quarter inch. Any acceptable alloy can be used to construct the rod section 11610. In alternate embodiments, the rod can be constructed from steel or another material. Each end 11620 of the rod includes a threaded socket for receiving a tie rod end 11630. The direction of the threads oppose each other so that rotation (double-curved arrow 11640) of the rod 11610 in either direction causes the tie rod ends to move outwardly or inwardly (double arrows 11642) to either lengthen or shorten (respectively) the overall distance between tie rod ends 11630. As shown, the tie rod ends 11630 each include a swiveling ball stud 11650 that attaches by a threaded shaft and corresponding nut (not shown) to each of the swing arm frame 9930 and corresponding upper or lower panel 9910, 9920. Once the panels of the aerodynamic assembly 9900 have been installed, the tie rods 11610 are rotated in the appropriate direction so that the panels reach the desired orientation in their deployed position. In other words, they seat properly with respect to the locking mechanism 9997 and 9999 when fully deployed. The adjusted position of each rod 11610 with respect to the tie rod ends 11630 can be secured using jam nuts (not shown) which ride on the treaded shaft 11670 of each tie rod end. The jam nuts are brought into contact with the end 11620 of the rod 11610 when the appropriate adjustment has been achieved.

As discussed above, with reference to a roll-top door embodiment of a trailer shown, for example in FIG. 49, the illustrative embodiment of FIG. 99, or any other embodiment that is adapted for mounting on opposed hinged doors can be provided to a rolling door enclosed within a rear door frame. Such an embodiment can be implemented in the illustrative embodiment by attaching hinge butt plates (9994, 9996) to the corners of the roll-top door frame and mounting a secondary hinged door or framework to the door hinge units (9992) of the butt plate. This secondary door or frame supports the upper and lower panel-folding hinges, and provides attachment points for the linkage (swing arm 9930) and other door-mounted components of the aerodynamic assembly. The assembly is folded and hinged into a 270-degree opened position to access the underlying roll-top door (or another “primary” door assembly which affords actual access to the trailer). Appropriate latches can be provided to the secondary door so that it remains in pace when the vehicle is in motion. For example, a set of secondary door lock rods similar to those used on conventional hinged main trailer doors can be employed.

It should be clear that this invention contemplates a variety of systems and methods for providing improved aerodynamic performance to original equipment and retrofitted vehicles. The teachings of this invention provide a number of solutions to challenges faced including, but not limited to, those of mounting the assembly, folding and deploying it to access the cargo doors, vehicle lighting, streamlining, sealing leaks and accessing door locking structures. The solutions provided are easy to use, cost effective and universal to a large number of trailer types, including those with hinged and rolling doors.

The foregoing has been a detailed description of illustrative embodiments of the invention. Various modifications and additions can be made without departing from the spirit and scope of this invention. Each of the various embodiments described above may be combined with other described embodiments in order to provide multiple features. Furthermore, while the foregoing describes a number of separate embodiments of the apparatus and method of the present invention, what has been described herein is merely illustrative of the application of the principles of the present invention. For example, additional attachments and improvements can be made to the rear of the vehicle to further enhance the security and capabilities of the aerodynamic structure of this invention. Such enhancements can include extended bumper assemblies that project rearward beyond the folded aerodynamic assemblies, or special reflectors and/or lighting on the edges of the structure and/or spacer frame. Similarly, while not shown, any of the embodiments described herein can include flexible or rigid gaskets or other seal members that extend between the aerodynamic assembly and the trailer body to further streamline the junction therebetween. The panels can be constructed from a variety of durable materials or a combination of materials. For example, the panels can include rigid or semi-rigid frames covered in a flexible fabric or similar sheet material. In further embodiments, a series of fabric or flexible wells of a predetermined shape (for example a bowl or dish shape) can be defined within the central cavity of each aerodynamic structure when deployed. Such a well shape may enhance the aerodynamic effect. In addition, it is expressly contemplated that any of the mechanisms and features shown and described herein can be combined with other mechanisms and features as appropriate. Accordingly, this description is meant to be taken only by way of example, and not to otherwise limit the scope of this invention.

FIG. 117 details the rear end of a conventional tractor trailer body 100 ₁, which has been provided with aerodynamic assembly 110 ₁ along its rear end. The assembly operates to reduce drag as a truck and trailer move at high speed down a roadway. For background, the operation of an aerodynamic assembly having a panel arrangement similar to that shown herein is described in the above-incorporated U.S. patent application Ser. No. 12/122,645, published as U.S. Published Application No. 2008/0309122 A1, filed May 16, 2008, entitled REAR-MOUNTED AERODYNAMIC STRUCTURE FOR TRUCK CARGO BODIES, the teachings of which are expressly incorporated herein by reference as further background information. The aerodynamic assembly 100 ₁ is arranged in two halves. A right half 112 ₁ is mounted with respect to a right-hinged door 122 ₁, and a left half 114 ₁ is mounted with respect to a left-hinged door 124 ₁. A joint 116 ₁ between the halves 112 ₁ and 114 ₁ is provided. This joint is aligned with the joint 126 ₁ between the two doors 122 ₁ and 124 ₁. For the below, the joint 116 ₁ is comprised of closely engaging, overlapping seals manufactured from a suitable elastomer. As shown, each door includes a plurality of conventional hinges 128 ₁ that are placed at appropriate locations with respect to the rear frame 130 ₁ of the trailer body. The rear frame 130 ₁ is constructed as a rectangular framework consisting of box or channel members. It is further constructed from a sturdy metal, such as steel. The doors are adapted to swing outwardly, as shown by the curved arrows 132 ₁. This outward swing is approximately 270 degrees, so that the doors normally attach (using an appropriate hook-up or other hold-down assembly) against the adjacent sides 134 ₁ of the trailer body. In this manner, and as described above, the doors 122 ₁, 124 ₁ exhibit a low-profile against the sides of the trailer body when fully opened. This allows the trailer to be parked side-by-side with other trailers in a loading dock free of interference. In other words, when the doors are fully folded against the sides of the trailer body, they do not obstruct or interfere with the doors of adjacent side-by-side trailers in the dock (which may be closely adjacent to each other).

In order to facilitate the use of an aerodynamic structure on the rear of a trailer body, while still allowing doors to be accessible, and to open fully, each aerodynamic assembly half 112 ₁ and 114 ₁ should fold flushly against the door, providing a low profile that, when the doors are opened approximately 270 degrees, does not interfere with the side of the trailer body. If the folded aerodynamic assemblies exhibit too high of a profile, then the hinge edges of the doors will bind against the sides of the trailer body as they are opened, and will not be able to lie flushly against the trailer body sides. The above-incorporated, published U.S. patent application includes certain embodiments that provide modified door hinges. However, this requires substantial modification to the trailer and does not universally address various door configurations. Thus, the illustrative embodiment provides an aerodynamic assembly that effectively channels air to reduce drag at the rear of the trailer body, while also allowing the aerodynamic assemblies to be folded flushly against the doors when not in use, so that they are free of interference with respect to the door sides when the doors are fully opened and reside against the trailer sides.

The folded orientation is shown further in FIG. 118. Note that each half 112 ₁ and 114 ₁ folds flushly against its respective door in a low-profile manner. In an embodiment, this profile is no more than approximately 1 inch outward from the door surface at the side of the trailer body and no more than approximately 4 inches outward from the door surface at the centerline of the body between the right hand and left hand doors. A gap 210 ₁ is aligned relative to the door seam 126 ₁ so that, when the doors 122 ₁ and 124 ₁ are swung open, the folded panel assemblies 112 ₁ and 114 ₁ residing on each door do not interfere with each other. As described further below, each door includes a lock rod 140 ₁ that is rotated by a respective handle 220 ₁ into and out of a locked orientation. The aerodynamic assembly is oriented at its bottom end so as to allow access to the lock rod handle 220 ₁ and other associated locking mechanisms. This geometry still sufficiently to provide desired improvement of the body's aerodynamics, notwithstanding that the bottom panels 152 ₁ and 154 ₁ are elevated above the bottom edge 130 ₁ of the frame 160 ₁ by approximately 1 to 1½ feet. In alternate embodiments, the bottom panels 152 ₁ and 154 ₁ can be located lower on the frame, with appropriate accommodations made for the actuation of the lock rods 140 ₁ and other components, such as tail lights.

With further reference to FIGS. 119 and 120, the arrangement of panel members in the overall aerodynamic assembly 110 ₁ are shown in further detail. In addition to the bottom panels 152 ₁ and 154 ₁, each aerodynamic assembly half 112 ₁ and 114 ₁ includes a top panel 162 ₁ and 164 ₁, respectively. There are also provided respective right-hand and left-hand side panels 172 ₁ and 174 ₁ that extend approximately the full height of each door 122 ₁ and 124 ₁ along the respective side edges 161 ₁ of the frame 160 ₁. The illustrative dimensions and angles of the panels are described in further detail below. Generally, the top panels 162 ₁ and 164 ₁ and bottom panels 152 ₁ and 154 ₁ each consist of a pair of panel sections. More particularly, the right upper panel 112 ₁ consists of a door-hinged panel section 182 ₁ and a side panel-hinged panel section 183 ₁. These are joined at a diagonal hinge line 185 ₁. Likewise, the left upper panel 164 ₁ consists of door-hinged panel section 184 ₁, a side panel-hinged panel section 187 ₁ and a diagonal hinge line 189 ₁ therebetween. Similarly, the bottom panels 152 ₁ and 154 ₁ consist of panel sections 192 ₁, 193 ₁, 194 ₁ and 197 ₁ respectively. The top and bottom panels are substantially similar in shape and folding function in this embodiment.

To facilitate folding (retraction) and unfolding (deployment) of each aerodynamic assembly half 112 ₁ and 114 ₁, a swing arm assembly 198 ₁ and 199 ₁ is mounted to the surface of each respective door 122 ₁ and 124 ₁, and also to the upper and lower panels 162 ₁, 164 ₁, 152 ₁ and 154 ₁. More particularly, the swing arm assemblies are linked to each door-hinged panel section 162 ₁, 164 ₁, 192 ₁, 194 ₁. Each swing arm assembly 198 ₁ and 199 ₁ coordinates movement of the panel sections, which are otherwise hinged together, to cause them to fold in a predetermined synchronous fashion. That is, the door-hinged panel sections 182 ₁ and 192 ₁ fold toward each other, while the side-hinged panel sections 183 ₁ and 193 ₁ fold away from each other. The side panel itself folds inwardly toward the door. As shown particularly in FIG. 120, when the opposing side panels 172 ₁, 174 ₁ are fully folded, their rearmost (now inboard) edges 430 ₁, 432 ₁ are located in close proximity (within two inches or less spacing) along the centerline 126 ₁ between doors 122 ₁ and 124 ₁.

Note that the rearward extension of the side panels in this embodiment is generally designed to optimize the overall rearward length of the aerodynamic assembly, without causing the opposing side panels to overlap and interfere with each other when folded. In alternate embodiment, for example where regulations require the rearward extension to be reduced, the side panels can define a shorter rearward dimension, and the gap between panels when folded is accordingly larger. In an exemplary embodiment, side panels having a rearward extension, when deployed of no more than two feet can be provided. In such embodiments, the angle of inward taper of the various panels can be varied from that shown—for example to provide a steeper angle of taper on some or all sides.

Reference is now made to FIGS. 121, 122, 123 and 124, which show the right panel half 112 ₁ in greater detail. The description of this panel half also applies to the left panel half 114 ₁, which is a mirror image thereof (and functions identically), but whose description omitted for brevity.

FIGS. 121, 122, 123 and 124 particularly show the arrangement of top, side and bottom panels and interconnection therebetween in further detail. The two sections 182 ₁ and 183 ₁ of the top panel are joined at the common hinge line 185 ₁ using a plurality of living hinges 510 ₁. These hinges consist of individual strips of a durable polymer that is secured by a plurality of rivets or other fasteners to the edge of each panel section. Hinges are secured to both interior-facing (i.e. toward the inside of the assembly box) and exterior-facing (i.e. toward the outside environment) panel surfaces. Typically, hinges are placed on a side based upon how the adjoined, confronting panels are meant to fold. More particularly, hinges are illustratively located on panel sides that fold up against each other. Thus, the hinges between top and bottom panel sections are placed on exterior surfaces, as these fold toward each other as they scissor inwardly during retraction. Conversely, the respective right-angle hinge joints between the top and bottom panels and the side panel are placed long interior surfaces, as these panels ford against each other along those faces. A sufficient number of hinge strips are provided to prevent misalignment of the two adjoined panels but also to enable hinged folding without substantial resistance. In an embodiment three or four hinges are used between confronting panels, depending upon their length along the hinge line. The number of hinges used between panels can also vary depending in part upon the length of individual hinge strips. In certain embodiments, significantly longer hinge strips can be used, including full-length hinge strips where appropriate. Use of living hinges is also advantageous in that it allows for some misalignment of panels when they are folded into an overlapping arrangement. Thus, the connections are secure enough that, when unfolded, the panels assume an aligned and continuous shape. Living hinges are provided between the panel sections 182 ₁ and 183 ₁ of the top panel 162 ₁, as well as the panel sections 192 ₁ and 193 ₁ of the bottom panel 152 ₁. Living hinges are also provided at the corner joints between the panel sections 183 ₁ and 193 ₁ and the side panel 172 ₁. In this embodiment, three living hinges are provided between each panel joint. The living hinges are approximately 6 inches long and approximately 2 inches wide (width being the dimension spanning the hinge line), with approximately 1 inch of width of the hinge extended on either opposing panel. It is expressly contemplated that in alternate embodiments, the panels can be joined by mechanical hinges (for example, metal piano-style hinges or butt hinges) or another hinge mechanism of conventional design. In an embodiment, the living hinges are constructed from polyolefin plastic having a thickness of approximately ⅛ inch. The hinge fastener holes are provided generally offset from each other on each opposing side of the hinge so as to avoid stress concentrations. In an embodiment, one side receives three fasteners and one side receives two fasteners in an offset alignment across the width. Since the hinges are relatively low in profile, external placement does not materially affect the overall aerodynamics of the assembly.

The panels are themselves constructed from a weather-resistant sheet material that is durable, and stiff-but-flexible. In an embodiment, the sheet material is a composite. It can be a combination of resin and glass fibers, resin and carbon fibers, resin and polymer fibers (for example, a woven matrix) or another durable heat material. The resin can be epoxy, polyester, or another appropriate medium. In an illustrative embodiment, the sheets are constructed from a commercially available thermoplastic composite having a thickness of approximately ⅛ inch. In general, constructing panels from a sheet with a thin cross section is desirable in that it facilitates a lowered profile on the door when the assembly is folded (and stacked) against it. Typically, the sheet material desirably has a thickness of between approximately 1/16 and 3/16 inch to maintain desired strength and wind-resistance, while allowing for stackability against the truck body door surface. In order to reinforce the outer edges of the panels, a series of L-shaped channel members fastened (using rivets or other appropriate fasteners) to the three, unattached edges of each panel. In this embodiment, the channel member 520 ₁ is attached to the panel section 182 ₁, member 522 ₁ is attached to panel section 183 ₁, member 524 ₁ is attached to side panel 172 ₁, member 526 ₁ is attached to panel section 192 ₁ and member 528 ₁ is attached to panel section 193 ₁. Panel members can be constructed from a durable plastic, composite or metal (such as aluminum) with a thickness of approximately 1/16- 3/16. It defines a height of between approximately ¼ and ⅜ inch in each dimension (i.e., each dimension of the L-cross-section). In alternate embodiments, different shapes and types of stiffeners can be used on the edges. For example, a stiff edge bead can be applied over the rear edges of each panel. The stiffening members project inwardly so as to reduce their aerodynamic drag effect. The members define a height that does not interfere with the stacking of the folded panel sections. The height of the stiffeners is in part accommodated by the ability of the living hinges to allow spread between folded panels. In addition, as described below, the door-to-panel hinges are placed on angles so that the inner edges of each folded panel define a slightly thicker stack-up than the edges adjacent to the door hinges.

The side panel 172 ₁ is attached directly to the door surface by a series of hinges 710 ₁. These hinges are standard strap-type hinges with hinge pins aligned along a common vertical axis. Shown in FIG. 121, the strap 540 ₁ of the hinge 710 ₁ extends inwardly along the door so as to clear the vertical frame section 542 ₁. The strap 540 ₁ extends rearwardly in the region of the frame member 542 ₁ to allow the panel 172 ₁ to reside relatively close to the side edge frame and truck body. This provides a more streamlined arrangement along the sides. The panel sections 182 ₁ and 192 ₁ are attached via associated hinges 550 ₁, 552 ₁, 560 ₁ and 562 ₁ that are also secured directly to the door surface. In general, hinges on all sides are secured to the door surface using conventional fasteners, such as those used to secure the standard door hinges 128 ₁. Associated washers or washer plates can be provided on the opposing (interior) side of the door (not shown) to spread the load of each hinge fastener. The placement of hinges along each panel edge is highly variable. In general, the hinges 550 ₁, 552 ₁, 560 ₁ and 562 ₁ are placed so that they do not interfere with most conventional lock rod placements (either a single lock rod per door, or double lock rods per door, as described below). In this embodiment, the inboard hinges 550 ₁ and 560 ₁ are placed approximately 6 to 9 inches from the inboard edge 640 ₁ of the panel 162 ₁. The outboard hinges 552 ₁ and 562 ₁ are placed approximately 8 to 11 inches from the outboard corner 641 ₁ of the panel 162 ₁. The hinges 710 ₁ of side panel 172 ₁ are positioned vertically near the outboard (hinged) edge of the door 122 ₁ so as to avoid interference with a wide variety of commercially-available door hinge placements common to various standard truck trailer bodies. Such door hinge placements may vary widely both in location and in number depending upon the make and model of trailer body.

Note, as used herein the term “inboard” shall refer to a location toward the center of the trailer body along a widthwise direction and more particularly to a location more adjacent to the line between the two doors 122 ₁, 124 ₁. The term “outboard” shall refer to a location more distant from the center in a widthwise direction across the body, and more adjacent to the outer sides. The term “rearward” (and variations thereof) shall refer to a direction toward the rear of the body and the term “forward” (and variations thereof) shall refer to a direction toward the front of the body. The term “up” (and variations thereof) shall refer to a direction toward the “top” of the vehicle body, while the term “down” (and variations thereof) shall refer to a direction toward the “bottom” of the vehicle body. These terms, and other locational/directional terms used herein, are merely conventions to describe relative locations and directions, and should not be taken as absolute unless otherwise stated. All directions assume the body rests on a relatively flat surface, and right-side-up, with respect to the direction of gravity.

In this embodiment, the use of four hinges 710 ₁ along the edge of the side panel 172 ₁ is sufficient to provide the desired support for the side panel 172 ₁ without fluttering or deforming in high-speed/high-airflow environments. Illustratively, the approximate placement of the three hinges 710 ₁ is at (a) 16.5 inches from the side panel top corner, (b) 37.5 inches from the side panel top corner, (c) 67 inches from the side panel top corner, and (d) 99.5 inches from the side panel top corner (or 10.75 inches from the side panel bottom corner). Other numbers of hinges and placements of hinges for securing the side panels or for securing the top and bottom panels (than that shown and described) are expressly contemplated. Moreover, the hinge arrangement shown herein is particularly desirable in retrofit embodiments where the panels are to be applied to doors of a variety of makes and models of truck trailer bodies. Where panels are applied to OEM (original equipment manufacturer) installations, the dimensions and placements described herein can vary, and be customized, to particularly suit that OEM's parameters. For example, the placement of panels with respect to doors can be adapted to a more-optimized door geometry. Also, the panels can be integrated with lighting systems to allow effective transmission of required illumination. A variety of other modifications to panels to better integrate with the door structures can be implemented in OEM versions of the arrangement in accordance with this invention. As shown more clearly in FIG. 124, the side panel 172 ₁ includes a plurality of cutouts 810 ₁ along its door-adjacent edge 820 ₁. These cutouts are designed to accommodate the particular hinge placements 128 ₁ for the subject trailer body. In a retrofit environment, these cutouts can be made by the installer using an appropriate template (not shown). More particularly, and with reference to FIGS. 122 and 123, the dimensions and angles of the deployed assembly 100 ₁ are as follows. The top panel 162 ₁ defines an angle AT₁ of approximately 11 degrees and optionally between approximately 6 and 15 degrees with respect to the horizontal axis (perpendicular to gravity) 730 ₁. The rear-most edge 430 ₁ of the side panel 172 ₁ defines an overall height LVR₁ of approximately 87 inches between its two opposing outside corners. The bottom panel 152 ₁ defines an angle AB₁ of approximately 18 degrees with respect to the horizontal 730 ₁ and optionally, between approximately 6 and 30 degrees. With particularly reference to FIG. 122, the top and bottom panels 162 ₁ and 152 ₁ define a rearward depth LHD₁ of approximately 48 inches. The panel's rear edge 620 ₁ is oriented at a slight inward angle as shown in the plan view of FIG. 122. The side panel 172 ₁ defines a deployed angle AS₁ of approximately 13 degrees (and optionally between approximately 10 and 25 degrees) with respect to the front-to-rear direction (line 621 ₁) of the truck body. The rear edge 620 ₁ of the top and bottom panels 162 ₁ and 152 ₁ likewise defines a cross-body (perpendicular to the direction 621 ₁) width LHR₁ of approximately 38 inches as shown. The width of the panels at the door side is approximately the same as that of the outer door frame edge 161 ₁ with appropriate clearance provided for the overlapping weather seals along the inward edge 640 ₁.

It should be noted that the stated angles AT₁, AB₁ and AS₁ are highly variable. They are provided to afford the desired degree of aerodynamic efficiency, while also allowing for practical considerations, such as ease of folding, and clearance to view required safety features such as tail lights and top marker lights. In alternate embodiments, these angles, as well as the stated dimensions of panels can be varied several degrees and/or inches. Moreover, in the illustrative embodiment, the placement of the bottom panel 152 ₁ is shown as upwardly inboard with respect to the bottom edge 750 ₁ of the side panel 172 ₁. This is to allow for clearance of the lock rods 220 ₁ when the panels are in a folded orientation (see FIG. 120). The continued skirt with curvilinear bottom edge, which resides below the hinge joint with each bottom panel slightly increases efficiency. This extended bottom side skirt also provides a pleasing, aesthetic effect by giving the impression that the entire door is fully enclosed by the aerodynamic fairing. This skirt feature can be omitted in alternate embodiments. Moreover, where lock rod actuation mechanisms are provided in a different arrangement than the conventional configuration as depicted, the bottom panels can be extended further downwardly to cover more of the overall door surface.

Reference is now also made to FIG. 125, which shows swing arm assembly 198 ₁ in further detail. The swing arm assembly 198 ₁ consists of a main frame 910 ₁ with an outer vertical beam 912 ₁, a pair of interconnected horizontal arms 914 ₁, and an inner vertical beam 916 ₁. The inner vertical beam 916 ₁ is attached, at two opposing, to each of a pair of hinge assemblies 920 ₁, respectively. In an embodiment, the swing arm members are constructed from square steel members with appropriate corrosion-resistant coating(s) applied thereto. The members are welded together using conventional techniques. In an alternate embodiment, one or more of the members can be constructed from a differing metal or a synthetic material (polymer, composite, etc.). Likewise, the swing arm can be molded or formed as a unitary member, with or without substantial hollow spaces (voids) between interconnected members.

As shown for example in FIG. 121, the hinge assemblies of the swing arm assembly 198 ₁ are each mounted to the surface of the door 182 ₁ near its inboard edge 580 ₁. In an embodiment, the hinge assemblies 920 ₁ are mounted on the door 122 ₁ at a distance WH of approximately 12 inches with respect to the inboard door edge 580 ₁. The hinge assemblies 920 ₁ are attached using conventional fasteners that pass through the door for secure attachment. The hinge assemblies 920 ₁ enable the swing arm, consisting of the interconnected vertical and horizontal frame members 912 ₁, 914 ₁ and 916 ₁, to rotate as a unit toward and away from the door surface. In an embodiment, the opposing ends 930 ₁ of the outer vertical member 912 ₁ include triangular braces that each provides respective attachment points 932 ₁ for each of a pair of tie rods 934 ₁. A ball joint or other interconnection, which allows for movement in a multiple degrees of freedom, is used at each attachment point 932 ₁. The opposing ball joint (or other connection) 938 ₁ is attached at the opposing end of each tie rod 934 ₁. These connections join to bases 940 ₁ on the top section 182 ₁ and bottom section 192 ₁. The bases 940 ₁ are mounted approximately halfway along the front-to-rear distance of the panel section edge (640 ₁) and approximately 3-6 inches from the inboard edge (640 ₁). Other locations for placement of the illustrative tie rod connections on respective panels are expressly contemplated.

In addition, the swing arm assembly's vertical member 912 ₁ is interconnected by a pivot 950 ₁ to one end of a gas spring assembly 960 ₁. The gas spring assembly 960 ₁ can have a resistive spring force of approximately 70 lbf in an illustrative embodiment. Gas springs with alternate force levels are expressly contemplated. In an embodiment, a gas spring model 89U150368BB0312 (available from Industrial Gas Springs, Inc. of Eaton, Pa.), is employed by way of example. The opposing end of the gas spring assembly 960 ₁ is mounted by a pivot 962 ₁ to a base 970 ₁ that resides on the surface of the door 122 ₁. The base 970 ₁ is mounted using conventional fasteners that, like other elements herein, pass through the door and are secured by nuts, washers and/or other appropriate fastening mechanisms. Advantageously, a gas spring provides both a damping resistance to cushion deployment, and a predetermined spring force to ensure full deployment and resist retraction due to airflow, in a single package. Thus, when the folded panel assembly is released, the gas spring 960 ₁ extends at a predetermined (damped) rate under the force of its spring. When the frame assembly 198 ₁ pivots on its hinges 920 ₁, it moves tie rods (double arrows 980 ₁) between folded and deployed orientations. In the folded orientation, the assembly resists the spring force, compressing the spring as the frame is oriented flush against the surface of the door. In the deployed orientation, the gas spring 960 ₁ forces the swing arm to rotate outwardly toward the edge 161 ₁ of the door frame 160 ₁, thereby causing the tie rods 934 ₁ to bias the top and bottom panels 162 ₁, 152 ₁ away from each other during deployment (the top tie rod biasing its panel 162 ₁ upwardly, and the bottom tie rod biasing its panel 152 ₁ downwardly downwardly). Thus, in the folded orientation, the top and bottom panel sections 182 ₁ and 192 ₁ are simultaneously drawn inwardly toward each other (the top panel 182 ₁ being downwardly and the bottom panel 192 ₁ being drawn upwardly) by the tie rods. Conversely, when the gas spring forces the swing arm outwardly, the tie rods bias the folding top panel upwardly and the folding bottom panel downwardly. Because the top panel door-hinged section 182 ₁ and bottom panel door-hinged section 192 ₁ are joined to respective top panel sections 183 ₁ and 193 ₁, these panels are also folded inwardly toward each other along the hinge line with the side panel 172 ₁. This folding action further causes the side panel to be drawn inward toward the door surface on its hinges 710 ₁. Thus, the action of the swing arm 198 ₁ simultaneously moves all panels between the folded and deployed orientations. In an embodiment, the outward length of the swing arm LSA₁ is approximately 16.5 inches. Likewise, the height HSA₁ of the vertical member 912 ₁ is approximately 37.25 inches. Each tie rod has an overall length of approximately 24 inches. This overall rod length is adjustable in an illustrative embodiment, since the opposing ball joint connections include a threaded stem (see, for example, stems 1020 ₁ in FIGS. 126 and 127) that seats into a threaded well in each end of the rod body. This adjustability allows for fine tuning during assembly. The tie rods, fittings and other swing arm components can be constructed from a corrosion-resistant material, such as stainless steel or a durable aluminum alloy.

With further reference to FIGS. 126 and 127, fine tuning of the tie rod lengths is desirable, in part, because the sections 182 ₁, 183 ₁ and 192 ₁, 193 ₁ of the respective top and bottom panels 162 ₁ and 152 ₁ are typically maintained at a slight non-planar orientation with respect to each other. That is, as shown in FIG. 126, in a fully deployed orientation, the top and bottom panels 162 ₁, 152 ₁ define a slightly inward fold (an external valley) that generates a relative valley angle AF₁ therebetween. That is, the plane (line 1030 ₁) of the depicted panel section 192 ₁ is angled with respect to the plane 1040 ₁ of the panel 193 ₁. Providing a slight non-planar valley angle (inwardly directed fold) between the panel sections ensures that each panel can be moved to the folded orientation free of any season by the top and bottom panels. In an embodiment, the valley angle AF₁ of the top panel 162 ₁ valley is approximately 2 degrees and the valley angle AF₁ of the bottom panel 152 ₁ is approximately 22 degrees—a somewhat more aggressive angle, since this panel is partly removed from direct airflow thereover, and this large angle assists in allowing ease of folding of the assembly.

By way of further explanation, if the top and bottom panels were completely planar, and the user desired to fold the side panel so as to actuate the overall folding motion via the swing arm, the top and bottom panels might seize up due to their planar orientation. By inducing a small inner fold in each panel, the swinging motion of the side panel causes immediate, inwardly directed (toward each other) buckling of the two respective panel sections for each of the top and bottom panels. This buckling allows the tie rods 934 ₁ to move and rotate inwardly toward the door, which in turn, causes the swing arm to rotate on its hinges so as to compress the gas spring assembly 960 ₁. In order to induce the slight inward valley angle AF₁ between panel sections 182 ₁, 183 ₁ and 192 ₁, 193 ₁, each door-hinged panel section 182 ₁ and 192 ₁ includes an attached cable 1040 ₁ (note that the cable can be alternately attached to the side panel-hinged section 183 ₁, 193 ₁). Each opposing end of each cable is attached to an associated footman's loop 1042 ₁ (or other appropriate base), with one cable end thereby attached to the panel and the other cable end attached to the door 122 ₁. One or both ends of the cable can include a turnbuckle, or other length-adjuster (not shown), to accurately adjust the cable's overall length. Thus, when fully deployed, each cable 1040 ₁ acts as a stop to prevent further outward movement of the panel sections 182 ₁ and 192 ₁. This, accordingly, prevents overextension of the swing arm assembly 198 ₁ while still allowing full deployment of the assembly 100 ₁. As noted, the valley angle AF₁ between panel sections that is created by each cable's restraint does not appreciably alter the overall aerodynamics of the unit.

Notably, the force of the gas spring 960 ₁, acting through the swing arm assembly 198 ₁, provides sufficient holding strength to maintain the aerodynamic assembly in a deployed position without fluttering of folding even at substantial highway speeds and under high wind conditions in all directions. However, the spring's force can be overcome easily to allow deliberate folding/retraction of the assembly by simply grasping and rotating the side panel toward the door surface, as described further below, simply opening the door and moving it toward the body side so as to induce the assembly to collapse as the side panel engages the body side.

Moreover, as described further below, the gas spring 960 ₁ provides a sufficient bias force to the swing arm assembly 198 ₁ so that, when released, the folded panel assembly on each half is capable of “one-touch” (i.e. releasing the catch via the release cable 1422 ₁) “automatic deployment.” That is, by only releasing the catch, the spring thereafter biases the swing arm assembly to rotate outwardly from the door, thereby expanding the inwardly folded top and bottom panel sections and causing the side panel to rotate outwardly into the deployed orientation free of the user's grasping and pulling of the panels themselves. In other embodiments as described n=below and in the above-incorporated U.S. patent application Ser. No. 12/122,645, published as U.S. Published Application No. 2008/0309122 A1, filed May 16, 2008, entitled REAR-MOUNTED AERODYNAMIC STRUCTURE FOR TRUCK CARGO BODIES, other mechanisms for enabling retention of panels in a folded position and automatic deployment (e.g. user or speed-actuated activated actuators) are expressly contemplated instead of 9 or in addition to) a spring assembly.

One consideration with the folded panel assembly is that the door lock rod(s) and other surface mounted components generate a profile that extends approximately 1-2 inches rearwardly of the door's surface. These structures are generally inboard near the inboard door edges/seam. A number of geometric adaptations are provided to accommodate these (often) preexisting structures so as to allow the assembly to fold-up free of interference by, or with these structures. With reference to FIG. 126, and further reference to FIGS. 128 and 129, the top and bottom panels 162 ₁ and 152 ₁ are attached to the door 122 ₁ by respective hinges 550 ₁, 552 ₁ and 560 ₁, 562 ₁. The hinges each include a door bracket 1066 ₁ that is secured to the door 122 ₁ using conventional fasteners. The door brackets support a hinge pin that allows a panel bracket to rotate with respect thereto. In particular, the inboard hinges 550 ₁ and 560 ₁ include an attached panel bracket 1070 ₁ that offsets the hinge pin (axis) 1072 ₁ at a predetermined distance that is different (greater than) that of the hinge pin (axis) 1076 ₁ of the attached panel bracket 1074 ₁ the outboard hinges 552 ₁, 562 ₁. More generally, each of the top and bottom panels 162 ₁ and 152 ₁ are oriented parallel to the ground surface (e.g., perpendicular to the direction of gravity) while their hinges define axes that are angled with respect to the horizontal as shown. In this embodiment, the angle AHA₁ is approximately 2-3 degrees, and illustratively the angle AHA₁ is approximately 2.08 degrees. By angling the hinge axes inwardly toward each other, the top and bottom panels define a larger gap with respect to the door surface near the inboard edge of the door when they are folded. This allows the folded top, bottom and side panels (particularly door-hinged panel sections 182 ₁ and 192 ₁) to clear the lock rod 140 ₁ and the swing arm assembly 198 ₁. In other words, the folded panels form a rearwardly tapered pocket that is deeper near the center. This pocket has sufficient clearance, due to the geometry of the hinges 550 ₁, 552 ₁, 560 ₁, 562 ₁ to provide a space in which the swing arm and the lock rods can reside without binding on the folded panels. This geometry is largely determined by the dimensions of the panel bracket of each hinge and its relative pin placement. In an alternate embodiment, a larger number of hinges (more than two per panel) can be provided along the width of the door, with appropriately-sized panel brackets that allow each hinge pin to align along the angled overall hinge axis.

As shown in FIG. 122, the top and bottom panels 162 ₁ and 152 ₁ also include a cutout 670 ₁ (revealed partially where the rear weather seal has been removed) defined along a portion of the inboard, door-facing edge 672 ₁. With further reference to FIGS. 126 and 127, the cutout provides clearance for the lock rod 140 ₁. The panel hinge bracket 1070 ₁ is designed to bridge this gap 670 ₁. While omitted in FIG. 122 for clarity, the gap 670 ₁ typically includes a weather seal 1080 ₁. The weather seal typically comprises a durable, flexible elastomeric compound, such as rubber, polyurethane or silicone. It can include an embedded metal stiffener and/or internal edge clips according to a conventional design. It is seated over the lip of the panel edge 672 ₁ in the region of the gap 670 ₁. Its free edge engages and seals against the door's surface to eliminate infiltration of air flow, thereby increasing the aerodynamic efficiency of the assembly. The seal 1080 ₁ is closely cut around the lock rod 140 ₁ as shown with a minimum of excess space between the lock rod and the seal. Based upon this design, the top and bottom panels 162 ₁ and 152 ₁ can be adapted to a variety of lock rod positions. Notably, as shown in the alternate example of a door 1110 ₁ in FIG. 127, a pair of lock rods 1130 ₁ and 1132 ₁ is employed on each door instead of the single lock rod 140 ₁ described above. This is a common arrangement on certain trailer bodies. The panel cutout 670 ₁ is long enough to accommodate most common arrangements and placements of lock rods, thereby increasing the versatility and retrofitability of the design. In this embodiment, the seal 1080 ₁ is cut with close-conforming slots 1120 ₁, 1122 ₁ to respectively accommodate each of these lock rods 1130 ₁, 1132 ₁ without compromising the overall aerodynamic seal between the panel and the door surface.

The geometry of the top and bottom panels 162 ₁, 152 ₁ is further adapted to allow for a pair of seals where the panels join at the inboard edge. As shown, the inboard edge 640 ₁ (revealed partially in FIG. 122 where the weather seal 1092 ₁ has been removed) of the top and bottom panels 162 ₁, 152 ₁ is positioned at an offset from the edge 1090 ₁ of the door 122 ₁. A gap of between approximately ¾ inch and 1½ inch is provided between the edge 640 ₁ and the centerline of the body. As shown, the weather seal 1092 ₁ seats over the lip of this edge (640 ₁) in a conventional manner, and the attached seal 1092 ₁ extends slightly beyond the door edge 1090 ₁ and body centerline (overlap OS₁ shown in FIG. 126). In this manner, the two weather seals 1092 ₁ on the panels of each door overlap each other by approximately ¼-¾ inch to form a lapped seal that prevents air infiltration. The resilience of the seals caused them to engage under modest pressure in the overlapped relationship to secure the air-resistant seal. The overlap is not so great as to cause the panels to interfere with each other during folding or unfolding. In other words, when one panel is folded, the seal 1092 ₁ passes over the opposing, overlapping seal without substantial resistance. Note that the seals 1080 ₁ and 1092 ₁ on each panel can be formed from the same, commercially available weather seal material. The two seals 1080 ₁ and 1092 ₁ can be joined at the rear corner 1098 ₁ using a 45-degree miter joint. The two mitered ends can be cemented together using an appropriate adhesive or sealant (silicone or polyurethane adhesive, for example), thereby providing an L-shaped weather seal structure. It is contemplated in an alternate embodiment that the two centerline seals 1092 ₁ can be replaced with a single wider seal on the top and bottom panels of only one side, which engages an unsealed edge of the opposing top and bottom panel, respectively. Alternatively the seal on one side can be wider than that of the other. In any of these embodiments, the edge 640 ₁ of a panel may extend further toward the centerline than that of the opposing panel.

This folded orientation is shown in side perspective view in FIG. 128. The side panel 172 ₁ is shown overlapping the bi-folded top and bottom panels 162 ₁ and 152 ₁ with sufficient clearance to avoid binding on the lock rod 140 ₁. The above-described weather seals are disengaged from the door surface and face upwardly and downwardly as shown.

While the weather seals described herein are press-fitted over the lips of panel edges, it is contemplated that alternate attachment mechanisms can be employed. For example a clip edge into which the seal seats can be attached to various panel edges. This can double as an edge stiffener in certain embodiments. Likewise, seals can be attached by fasteners to the panel edge. It is also expressly contemplated that other seals or rigid/semi-rigid fairings can be applied to various joints between panels and/or between panels and trailer body components. For example, a seal or fairing can be applied between the side pane's door-facing edge and the body's door frame side 161 ₁ to further seal against air infiltration and enhance the aerodynamic profile of the assembly.

To maintain the assembly in the depicted folded orientation of FIG. 128, a latching mechanism is provided to each half of the aerodynamic assembly according to an illustrative embodiment. With reference to FIG. 130, the latching mechanism of this embodiment consists of a pin 1410 ₁ that is mounted to the rear bottom edge (along the interior face) of the side panel 172 ₁ using a bracket 1412 ₁. The pin 1410 ₁ faces projects vertically and downwardly along the interior surface of the side panel 172 ₁. In an embodiment, it can be constructed from a ¼-½ inch diameter bolt of an appropriate grade and type of metal. The pin 1410 ₁ projects slightly below the adjacent edges of the bottom panel 152 ₁. A corresponding latch assembly 1420 ₁ is provided near the inboard centerline. In this embodiment, the latch is mounted on the exterior (facing outside the assembly) surface of each bottom panel. The latch can be any acceptable design. In this embodiment, the latch comprises a standard pin-capture latch that automatically receives and restrains the pin when it passes through the spring-loaded latch gate. Since the latch is fastened to the outside face of the bottom panel, it becomes aligned with the pin only after the bottom panel rotates into an approximately vertical alignment to face upwardly in the folded orientation. The latch assembly 1420 ₁ can include appropriate springs and other mechanisms that allow it to maintain capture of the pin 1410 ₁ until it is released. A release cord 1422 ₁ can be provided on the release mechanism of the latch assembly 1420 ₁ according to a conventional arrangement.

It should be noted that the depicted latch assembly is one of a variety of techniques for securing the assembly in a folded orientation. In an alternate embodiment, a simple eyebolt and hooked chain can be used—running between the side panel and the door surface. Likewise a bar or shock cord can be applied between the adjacent, folded side panels. As described further below, a latch can be omitted entirely.

In operation, when the user desires to retract and fold the assembly, he or she grasps the edge of the side panel and rotates the side panel toward the door surface. This causes the top and bottom panels 162 ₁ and 152 ₁ to begin scissoring toward each other along their hinge line 185 ₁. The scissoring effect causes the door-hinged panel sections 182 ₁ and 192 ₁ to rotate inwardly, toward each other, which biases the attached tie rods 934 ₁. This, in turn, causes the spring arm to work against the spring force of the gas spring, folding the entire arrangement in a coordinated manner. As the folding is completed, with the side panel moving into a confronting relationship with the door surface, the pin 1410 ₁ is finally captured by the latch assembly 1420 ₁, which thereafter retains the entire assembly in place, folded flush against the door. To deploy the assembly, the user simply releases the latch assembly 1420 ₁ by pulling on the cord 1422 ₁, and the gas spring operates to bias the swing arm outwardly from the door surface. This, in turn, unfolds the top and bottom panels, along with the interconnected side panels.

Note that the inherent damping effect of the gas spring is also advantageous in that it resists sudden impulse from jarring and gusts as the vehicle travels down the roar, but allows a firm, continuous force, applied during the folding action to be transmitted to overcome the spring force. The damping action also ensures that during deployment, the assembly gently attains its final unfolded orientation without a shock.

The geometry of the assembly allows for relatively low levels of applied force to fold each half of the assembly against its underlying door (termed “self-collapsing” herein). As noted above, in an embodiment the assembly can be folded simply by opening the door 122 ₁ and rotating it into its 270-degree fully opened position against the side of the truck body. Once fully opened, the door is latched against the truck body side using (for example) a conventional door mounted eye-bolt (or chain) and body-mounted hook arrangement (not shown). In such embodiments, the latch mechanism 1410 ₁ and latch assembly 1420 ₁ can potentially be omitted. This assumes that the assembly will remain deployed at all times when the door is opened.

Like automatic deployment, the above-described capability of the assembly half to “self-collapse” uniquely enhances the practicality and ease of use of the aerodynamic assembly half in accordance with various embodiments. It reduces the number of steps needed to access the interior of the body or otherwise move the panels out of rearwardly deployed orientation. In particular, the user need only reach for, and unlatch the door lock rod, grasp and rotate the door into engagement with the side of the vehicle body (as self-collapsing occurs) and secure the door to the body with a conventional hook. As it folds, the bottom panel and side panel can become secured together using their respective latch members (1410 ₁, 1420 ₁), for subsequent release (via pull cord 1422 ₁) when the door is again closed and secured for travel.

With reference to FIG. 131, the assembly's bottom panels can be provided as an open-frame geometry according to an alternate embodiment. Each of the bottom panels has been cut out, or otherwise formed from structural beam members, so that the outer frames 1510 ₁ and 1512 ₁ encompass a respective central opening 1514 ₁ and 1516 ₁. This open frame geometry has been adapted to reduce or eliminate the possibility of infiltration and/or accretion of snow, mud and the like, which is common particularly in Northern climates. While there is a slight decrease in the aerodynamic performance, it is counterbalanced by an increase in practical usability (for example, where snow may otherwise accumulate on a full bottom panel, and restrict or prevent retraction). The swing arm tie rod 934 ₁ is unchanged in this embodiment, and is attached to the outer frame 1510 ₁ of the panel, so that it functions in the same manner as set forth above. More particularly, the illustrative open framework functions in the same manner as the bottom panel sections 192 ₁ and 193 ₁ of FIG. 130. They are hinged together along a hinge line 1585 ₁ using resilient, living hinges as described above. The rigid components of the framework are composed of steel, aluminum, composites (fiberglass, carbon fiber, etc.), or the like. Note also that additional stiffening members, cross braces, etc. can be attached on and/or between the framework members that are depicted. These members should still allow for the minimal accretion of snow and debris. For the purposes of this description, the terms “bottom panel” and “bottom panel section” shall be taken to include open framework structures and their hinged sub-components.

Of course, it is contemplated that a differing geometry for achieving an open framework construction can be provided in alternate embodiments, generally with the goal of providing open space that prevents accretion of snow and other debris without compromising the rigidity of the overall four-sided aerodynamic assembly as it is exposed to highway speeds. Thus, any such structure can be referred to as a “bottom panel” or “bottom panel structure” in accordance with this description.

Having described the construction and general function of the aerodynamic assembly 100 ₁ according to illustrative embodiments, the application of an assembly to an existing trailer body (either OEM or retrofit) is now described in further detail.

The aerodynamic assembly is provided to an installer as plurality of component parts that are joined together and mounted on the trailer body according to a predetermined arrangement. Where the placement of trailer body door hinges 128 ₁ is known in advance, appropriate cutouts 810 ₁ can be provided in advance of installation (by the manufacturer) along the forward, door-facing edge of each side panel. The weather seal can be provided as a continuous, uncut length of material to be joined at a miter cut as described above, or the weather seal can come pre-constructed in the above-described L-shape, which is sized appropriately for mounting to each top and bottom panel. Because the overlapping central weather seals 1092 ₁ are relatively wide (1 inch or more), they can accommodate a small degree of variation in widths of doors and door frames that may occur for different makes and models of trailer bodies. Likewise, as noted above, the door-facing weather seal 1080 ₁ accommodates the potential for varied location of one or more lock rods on each door.

In preparing each door for installation, the installer employs a template (not shown) that can be constructed from paper, cardboard, or a more rigid material. The template is placed over the door and can include appropriate standoffs (spacer blocks and drill guides with tubular holes in the proper diameter) to clear the lock rod(s) and any handles, brackets, as well as the original hinges 128 ₁. Once the template is properly located on the door in a level position, it is secured in place (using clamps, temporary screws, tape, adhesive, human grip, etc.) while the installer drills all needed holes to mount the assembly's various hinges, brackets and bases to the door. As noted above, where the components are supplied to an installation in which the number and/or placement of original trailer body door hinges 128 ₁ is unknown, the side panel edges are unslotted. The installer then locates the vertical position or each hinge (128 ₁), and cuts appropriately sized slots (810 ₁) using a cutting bit or saber saw blade at the corresponding locations along the side panel's door-facing edge.

Once all of the holes are drilled and slots are cut, the panels are assembled together by applying fasteners to all living hinges in the appropriate locations. Panels can be predrilled to receive hinges and other components, such as stiffeners and mechanical door-to-panel hinges. The panels are then attached to each respective door using fasteners. The associated swing arm assembly is also attached to the door using fasteners that pass through its hinges and the door base of the gas spring. The swing arm assembly is then interconnected to the top and bottom panels by way of the tie rods (934 ₁). The tie rods (934 ₁) are adjusted to provide the appropriate angles of rearward projection to the top and bottom panels. Restraining cables (1040 ₁) are attached via footman's loops on the panels and doors, and adjusted to restrain the top and bottom panels with the desired valley angles between the top panel sections and the bottom panel sections, respectively. The top and bottom panels of the two assembly halves are also aligned so their center seals overlap and engage by adjusting the tie rods 934 ₁ and cables 1040 ₁ as appropriate. At some point during the installation procedure, weather seals 1080 ₁ and 1092 ₁ are attached, and slots are cut in the seals 1080 ₁ to accommodate one or more lock rods on each door. A sharp utility knife or punch can be used to cut rod slots in the seal.

During run-time operation of the trailer body with the attached aerodynamic assembly, it is contemplated that certain elements of the assembly will wear and require occasional replacement. For example, it may be desirable to replace some or all of the living hinges from time to time due to wear and tear, as well as due to damage caused by collisions with objects and vehicles. Notably, one advantage to the use of living hinges constructed from a pliable polymer material strip is that a collision between a panel of the aerodynamic assembly with an object or other vehicle will generally result, first, in tearing of one or more hinges before a panel crushes or shatters. Thus, the ability for the hinges to tear under modest impact forces tearing provides an energy-absorbing safety mechanism, which avoids more catastrophic failure of the assembly and/or damage to the colliding object or vehicle. Likewise, from time to time, gas springs may require replacement. This is a relatively straightforward undertaking, typically involving the removal of several fasteners and reattachment of a new gas spring with new or existing fasteners. In addition, weather seals may also occasionally require replacement. Again, this is a relatively straightforward operation in which the old weather seal is removed and a new weather seal is placed over the edge of the panel.

As described generally above, the panels are sized and arranged to allow for approved safety equipment. Appropriate reflectors, reflective tape, placards and instruction labels can be mounted or adhered to panels at appropriate locations. Additionally, panels can include LEDs and/or incandescent lighting as required (or desired) at various locations. Where lighting is included on a panel, appropriate electrical leads are typically provided from the trailer body to the panel (e.g. a flexible cable—not shown), which passes through the door frame or extends from the tail light pods. Alternatively, a door or panel-interior mounted battery and solar charger can provide power to lighting, with thin-film solar panels mounted, for example, along the top panels to provide charging power (not shown). It should be noted, however, that the arrangement as shown and described herein complies with current U.S. Transportation Regulations without the need of additional lighting on the panels themselves. In particular, the panels provide sufficient visibility for trailer top marker lights and tail lights, among others. With modifications to the panels' rearward length as described herein, the aerodynamic assembly can be readily adapted to other jurisdictions regulations, such as those of Canada.

It is contemplated that the aerodynamic assembly can be adapted to operate with a vehicle having non-dual-swing rear door according to an alternate embodiment. By way of example, FIG. 132 shows a vehicle rear 1610 ₁ having a roll-type door 1612 ₁ that rides along a track 1614 ₁ within the rear door frame 1616 ₁. This door spans the full width of the body, and is typically recessed forwardly within the frame 1616 ₁ as shown. A rear aerodynamic assembly is equally desirable in vehicles with non-dual-swinging door arrangements, and it is desirable to provide an assembly that allows for easy access to the door. In this embodiment, an aerodynamic assembly having a pair of aerodynamic assembly halves (the right-hand half 1620 ₁ being shown) is provided to the rear of the vehicle. The assembly in this exemplary embodiment is substantially similar to that described above (and like reference numbers are used for like components). Modifications can be made to the assembly in alternate embodiments to adapt the assembly to the particular application. In this embodiment the side panel hinges 710 ₁ and top/bottom panel hinges 550 ₁, 552 ₁, 560 ₁, 562 ₁ (552 ₁ and 562 ₁ being shown), all attached to a secondary swing-out door panel or open framework 1630 ₁. This door panel or framework 1630 ₁ provides the same base for mounting all components of the assembly 1620 ₁ and is provided in two halves, in the same manner of conventional dual swing-out doors. In particular, where the framework comprises a series of interconnected beams, it is contemplated that additional plates or cross braces are included to attach items such as the swing arm hinges 920 ₁. Alternatively, the secondary door panel 1630 ₁ can comprise a full panel constructed from metal, composite polymer or another acceptable material. For the purposes of this description the term “door” as used herein, in the context of mounting an aerodynamic assembly thereto, shall include a secondary door panel or framework (1630 ₁) that is attached to a portion of the vehicle rear overlying another form of door (roll-up, fabric, etc.), and allows for dual swing-out in the manner described for doors 122 ₁, 124 ₁ above. More generally, a door is any structure (framework, panel, partial-panel, etc.) to which an aerodynamic assembly half is attached. The secondary door panels or frameworks in the embodiment of FIG. 132 are, thus, arranged on the vehicle rear on separate hinges 1640 ₁ that are attached, for example to the rear frame 1616 ₁ of the body using screws or other fasteners. The number and placement of hinges 1640 ₁ is highly variable, and should be sufficient to support the weight of the secondary door panel or framework 1630 ₁ and the aerodynamic assembly half 1620 ₁ under aerodynamic loads. One or more seals or fairings 1650 ₁ can be provided between the door panel edge and the vehicle body. In the same manner as seals (1080 ₁, 1092 ₁, etc. described above) are provided to the assembly. The hinges 1640 ₁ are arranged to allow the right hand door or framework 1630 ₁ with folded aerodynamic assembly 1620 ₁ to swing outwardly approximately 270 degrees to fold back along the respective vehicle body side. Likewise, the left hand door or framework (not shown, but a mirror image of right hand door 1630 ₁) can be swung outwardly approximately 270 degrees to fold back along the respective vehicle body side. In this position a hook and chain can be used to secure each folded door unit to an eyebolt along the vehicle side (or using another conventional hold-down arrangement). This allows the vehicle to be parked side-by-side with other vehicles in a loading dock without interference therebetween. The roll-type (or other) door 1612 ₁ can then be opened conventionally, and the cargo handling can proceed in a normal fashion. After the cargo handling is complete and the trailer is removed from the loading dock, the right hand door or framework 1630 ₁ and left hand door or framework (not shown, but a mirror image of right hand door 1630 ₁) can be swung back through 270 degrees to close. The door or framework on each side is then secured using, for example, a latch mechanism 1660 ₁ that interacts with a receiving orifice in the frame. Any alternate latching mechanism can be employed. When the doors or frameworks are secured, the aerodynamic assembly is deployed.

While the above described embodiments and implementations of the aerodynamic assembly provide two halves of an overall four-sided aerodynamic panel structure (i.e. overall top formed from two panel halves, overall bottom formed from two panel/framework halves, right side panel and left side panel), with each aerodynamic assembly half residing on a respective door/framework, it is contemplated in alternate embodiments that both halves of the aerodynamic assembly as described herein can be mounted on a single door assembly or framework assembly that overlies a door, or more generally overlies the vehicle rear. Such a door assembly or framework assembly is adapted to swing out on hinges attached to the vehicle body so as to reveal the rear end of the vehicle. When swung out, such a door assembly with the two halves of the overall four-sided aerodynamic assembly can be positioned flush against the vehicle side, and allow for self-collapsing of the panels in each of the two halves (all against one side of the vehicle) in accordance with the above-described embodiments. In this manner, the aerodynamic assembly can be provided effectively to a roll-up rear door, a side curtain trailer with no rear door, or another vehicle where a single, full-sized door assembly or framework assembly is a convenient structure for mounting the aerodynamic assembly in accordance with the embodiments described herein. For the purposes of this description the term “door assembly” or “framework assembly” should be taken to include one or two swing-out doors that carry all, or a respective half of the aerodynamic assembly. The “door assembly” can be one or two doors that provide primary access to the vehicle or it can one or more overlying surfaces that selectively cover a primary door, curtain, etc., or pair of doors. As such, the door or framework 1630 ₁ of FIG. 132 as depicted can be one of a pair of doors or frameworks, each carrying a respective half of the overall four-sided aerodynamic assembly, that each open onto opposing sides of the vehicle body, or a single door or framework carrying both halves of the aerodynamic assembly and opening onto a single side of the vehicle.

It should be clear that the particular arrangement of panels, and their folding geometry is illustrative of a variety of possible arrangements, such as those contemplated in the above-incorporated U.S. patent application Ser. No. 12/122,645, filed May 16, 2008, entitled REAR-MOUNTED AERODYNAMIC STRUCTURE FOR TRUCK CARGO BODIES, which employ an “origami” folding geometry on each half of the overall assembly in combination with a respective, interconnecting swingarm between at least a portion of the top and bottom panels of each assembly half. In alternate embodiments the panels can be arranged to fold in the desired, low-profile stacking arrangement contemplated herein by providing different, or additional divisions between panel sections. For example, top and bottom panels can be solid and the side panels can include additional hinged sections—for example a central hinged section and top and bottom side panel hinged sections that interconnect to the solid top and bottom sections. Likewise, the top, bottom and side panels can variously include a plurality of hinged, sections, all joined together to form a continuous, foldable structure. More generally, an aerodynamic assembly, having a top panel structure, side panel structure and bottom panel structure (which can be an open framework), constructed and arranged to allow the panels to fold into a stacked arrangement against the door contemplates all the various geometries contemplated herein. These assemblies are illustratively adapted for automatic deployment, either through spring bias or through other actuated mechanisms and can self-collapse when the carrying door or framework is folded against the vehicle side.

It should further be clear that the trailer body aerodynamic assembly, unlike the majority of those proposed recently, provides a practical, cost effective, user friendly and realistic solution to the need for rear aerodynamic fairings on a trailer body or similar conveyance. This solution will not interfere with normal trucking operations and lends itself to ready use by the driver without any significant inconvenience. Moreover, this assembly is readily retrofittable to virtually all existing trailers and fleets with a minimum of downtime or added capital cost.

The foregoing has been a detailed description of illustrative embodiments of the invention. Various modifications and additions can be made without departing from the spirit and scope of this invention. Each of the various embodiments described above may be combined with other described embodiments in order to provide multiple features. Furthermore, while the foregoing describes a number of separate embodiments of the apparatus and method of the present invention, what has been described herein is merely illustrative of the application of the principles of the present invention. For example, it is contemplated that the valley angles induced in the rear panels can be generated according to a variety of alternate techniques. In one exemplary implementation, the top and bottom panel hinges (on the door and/or side panels) can include stops that generate the desired valley angles. Likewise valley angles can be generated stops between the panel sections or along the swing arm assembly or gas spring assemblies. Moreover, in some embodiments, the top and bottom panels can be assembled to include a degree of inward-biased flexure within their structures when fully deployed so that they are biased to fold inwardly when retracted. This flexure can be arranged by providing asymmetry to the joints between panels. Additionally, while the gas spring is manually biased into a folded orientation, it is expressly contemplated that the gas spring can be substituted with a power-drive actuator (e.g. fluid actuator, electromagnetic solenoid, powered lead screw, powered cable pulls, and the like) that automatically deploys and retracts the assembly ether based upon a user's commands and/or upon the prevailing speed of the vehicle. Such actuation, which can be defined as a form of “automatic deployment” employs an actuation switch (for selective deployment and actuation), and or controller circuit located, for example, in the vehicle cab and operated by a driver or based upon the detected speed. The actuator can be located in the pace of the gas spring or at one or more other locations that interconnect with panels. More significantly, while the aerodynamic assembly is shown in conjunction with a wheeled trailer body, the principles herein (including a secondary door structure overlying the actual door) can be adapted to other types of truck-borne structures, such as fixed body (non-trailer) trucks, tandem trailers and intermodal containers. More generally, the aerodynamic assembly can be adapted to other vehicle body rear shapes with appropriate modification of mounting arrangements and fairings using adapters and intermediate mounting components between the body and the assembly in accordance with ordinary skill—such as, for example a car-carrier body, a livestock carrier body, tanker body, a dump body, a side curtain trailer body, a drop frame trailer body, and the like. Accordingly, this description is meant to be taken only by way of example, and not to otherwise limit the scope of this invention. 

We claim:
 1. An aerodynamic device for a rear portion of a cargo body, comprising: an upper panel; a side panel; and a framework comprising a first member and a second member, wherein the upper panel and the side panel are each separately mounted to a door of the cargo body, wherein the upper panel and the side panel are adapted to have a deployed orientation and a retracted orientation, wherein the upper panel includes a leading edge and a trailing edge, the trailing edge positioned away from the cargo body and the leading edge proximate a top edge of the door when the upper panel is in the deployed orientation, wherein the first member of the framework is coupled to the door of the cargo body and to the second member of the framework, wherein the second member of the framework is coupled to the upper panel at an attachment point that is closer to the trailing edge of the upper panel than the leading edge of the upper panel, wherein the second member of the framework resists inward pressure by the upper panel when the upper panel is in the deployed orientation, and wherein in the retracted orientation, the framework is positioned flush against the door.
 2. The aerodynamic device of claim 1, wherein in the deployed orientation, the upper panel and the side panel taper rearwardly.
 3. The aerodynamic device of claim 1, wherein the side panel is planar.
 4. The aerodynamic device of claim 1, wherein the side panel is connected to the upper panel.
 5. The aerodynamic device of claim 1, wherein the door comprises a door frame.
 6. The aerodynamic device of claim 1, further comprising a lower panel, wherein the lower panel is coupled to the framework to allow for simultaneous movement with the upper panel.
 7. The aerodynamic device of claim 1, wherein the framework further comprises two or more rotating joints.
 8. The aerodynamic device of claim 1, wherein the upper panel comprises two upper panel sections, and wherein the side panel comprises one panel section.
 9. The aerodynamic device of claim 1, wherein the first member is a vertical connecting bar.
 10. The aerodynamic device of claim 1, wherein the second member of the framework is coupled to the upper panel substantially at the trailing edge of the upper panel.
 11. The aerodynamic device of claim 1, wherein the upper panel moves from the deployed orientation to the retracted orientation in response to movement of the framework.
 12. The aerodynamic device of claim 1, wherein the framework further comprises a latch, wherein the latch is coupled to the trailing edge of the upper panel.
 13. An aerodynamic device for a rear portion of a cargo body, comprising: an upper panel; a side panel; and a securing mechanism comprising a first member and a second member, wherein the upper panel and the side panel are adapted to have a deployed orientation and a retracted orientation, wherein the upper panel includes a leading edge and a trailing edge, the trailing edge positioned away from the cargo body and the leading edge proximate a top of the cargo body when the upper panel is in the deployed orientation, wherein the first member of the securing mechanism is coupled to a door of the cargo body and to the second member of the framework, wherein the second member of the securing mechanism is coupled to the upper panel at an attachment point that is closer to the trailing edge of the upper panel than the leading edge of the upper panel, wherein the second member of the securing mechanism resists inward pressure by the upper panel when the upper panel is in the deployed orientation, and wherein in the retracted orientation, the securing mechanism is positioned flush against the door.
 14. The aerodynamic device of claim 13, wherein the securing mechanism further comprises two or more rotating joints.
 15. The aerodynamic device of claim 13, wherein the framework further comprises a latch, wherein the latch is coupled to the trailing edge of the upper panel.
 16. The aerodynamic device of claim 13, wherein the first member is a vertical connecting bar.
 17. The aerodynamic device of claim 13, wherein the upper panel moves from the deployed orientation to the retracted orientation in response to movement of the securing mechanism.
 18. An aerodynamic device for a rear portion of a cargo body, comprising: an upper panel; a side panel; a lower panel; and a framework comprising a first member and a second member, wherein the upper panel and the side panel are each separately mounted to a door of the cargo body, wherein the upper panel and the side panel are adapted to have a deployed orientation and a retracted orientation, wherein the upper panel includes a leading edge and a trailing edge, the trailing edge positioned away from the cargo body and the leading edge proximate a top edge of the door when the upper panel is in the deployed orientation, wherein the lower panel is coupled to the framework to allow for simultaneous movement with the upper panel, wherein the first member of the framework is coupled to the door of the cargo body and to the second member of the framework, wherein the second member of the framework is coupled to the upper panel at an attachment point that is closer to the trailing edge of the upper panel than the leading edge of the upper panel, and wherein the second member of the framework resists inward pressure by the upper panel when the upper panel is in the deployed orientation. 